If your child freezes when asked “What’s 7 × 8?” or counts on their fingers for simple additions, you’re not alone. Mental maths is one of the most important — and most overlooked — skills in primary education.
This guide is written for parents, teachers, and learners who want to understand how to build mental maths skills from scratch, step by step. Whether you’re supporting a Year 2 child with number bonds or helping a Year 6 pupil speed up their times tables, you’ll find everything you need here.
We’ll also show you how tools like Hit the Button — one of the most popular maths practice games used in UK primary schools — can dramatically improve a child’s speed, accuracy, and confidence in mental maths.
By the end of this guide, you’ll know exactly how to teach mental maths in a structured, enjoyable way that actually works.
What Is Mental Maths?
Mental maths simply means doing maths calculations in your head — without a calculator or written working out.
It includes skills like:
- Recalling number facts instantly (e.g., 6 + 7 = 13)
- Multiplying and dividing quickly (e.g., 8 × 4 = 32)
- Rounding numbers and estimating
- Breaking numbers apart to make calculations easier
A quick example for a child: Imagine you’re at a shop and you buy a book for £4 and a pen for £3. You can figure out the total — £7 — in your head. That’s mental maths.
It’s not magic. It’s a skill anyone can learn with the right practice.
Why Mental Maths Matters (More Than You Think)
It’s Central to the UK Primary Curriculum
Mental maths is woven throughout the KS1 and KS2 National Curriculum. From Year 1 number bonds to Year 6 fraction calculations, children are expected to recall and apply number facts quickly.
Ofsted inspections frequently highlight fluency in mental maths as a key marker of strong maths teaching.
Real-Life Importance
Mental maths helps children:
- Work out change at a shop
- Calculate time (how long until lunch?)
- Share things equally
- Understand patterns in everyday life
Cognitive Benefits
Practising mental maths regularly:
- Strengthens working memory — the brain’s “scratchpad” for thinking
- Builds number sense — an intuitive understanding of how numbers relate
- Increases confidence — children who know their facts don’t fear maths lessons
- Improves problem-solving — faster recall frees up mental energy for harder thinking
Step-by-Step Guide to Teaching Mental Maths
Step 1: Start With Number Bonds
What it is: Number bonds are pairs of numbers that add up to a target number. The most important ones are bonds to 10 and bonds to 20.
Example:
- 3 + 7 = 10
- 6 + 4 = 10
- 12 + 8 = 20
How to teach it: Use fingers, counters, or simple visuals. Show a group of 10 objects, hide some, and ask how many are hidden. Make it a guessing game.
Mini tip: Once bonds to 10 are secure, bonds to 100 follow naturally (30 + 70, 45 + 55). Don’t rush — get the foundation solid first.
Step 2: Build Times Tables Gradually
What it is: Times tables are the backbone of mental multiplication and division.
Example:
- 6 × 7 = 42
- 9 × 4 = 36
How to teach it: Start with 2s, 5s, and 10s — these have clear patterns children can spot. Then move to 3s, 4s, and 6s. Save 7s, 8s, and 9s for last as these are hardest to memorise.
Use rhythm — many children learn tables faster when they say them aloud in a beat.
Mini tip: Don’t just drill forwards. Ask “What is 42 ÷ 6?” right after learning “6 × 7 = 42.” This builds division fluency at the same time — for free.
Step 3: Teach Number Splitting (Partitioning)
What it is: Breaking numbers into parts to make adding or multiplying easier.
Example: 37 + 45 feels hard. But split it: 30 + 40 = 70 7 + 5 = 12 70 + 12 = 82 ✓
How to teach it: Use place value cards or draw number lines. Ask children to identify the tens and ones before combining.
Mini tip: This strategy is especially powerful for children who panic with larger numbers. It shows them they already know how to handle the parts.
Step 4: Use Doubles and Near Doubles
What it is: Knowing doubles (6 + 6 = 12) makes “near doubles” easy (6 + 7 = 13 — just one more!).
Example:
- Double 8 = 16
- 8 + 9 = 17 (double 8 + 1)
How to teach it: Practise doubles first until they’re instant recall. Then introduce near doubles as a shortcut.
Mini tip: Children who know their doubles also find halving much easier — another mental maths win.
Step 5: Practise Bridging Through 10
What it is: When adding, make 10 first, then add the rest.
Example: 8 + 6 → 8 + 2 = 10 → 10 + 4 = 14 ✓
How to teach it: Use a ten frame (a 2×5 grid). Fill it up to 10, then count the leftovers. Visual practice first, then move to mental-only.
Mini tip: This is one of the most useful mental maths strategies and works all the way through KS2 for adding and subtracting larger numbers.
Easy Tricks and Shortcuts That Actually Work
Here are some memory hacks children genuinely enjoy:
The 9 Times Table Finger Trick Hold up all 10 fingers. To calculate 9 × 4, fold down your 4th finger. You see 3 fingers on the left and 6 on the right: answer is 36. Works for 9 × 1 through 9 × 10.
Multiplying by 5 Halve the number, then multiply by 10. Example: 5 × 8 → half of 8 = 4 → × 10 = 40 ✓
Multiplying by 4 Double the number, then double again. Example: 4 × 7 → double 7 = 14 → double 14 = 28 ✓
Adding 9 Add 10, then subtract 1. Example: 9 + 36 → 46 − 1 = 45 ✓
Squaring Numbers Ending in 5 Take the tens digit, multiply it by the next number up, then add 25. Example: 35² → 3 × 4 = 12 → answer is 1225 ✓ (great for Year 6!)
Common Mistakes and How to Fix Them
| Mistake | Why It Happens | Fix |
|---|---|---|
| Skipping number bonds | Jumping to tables too soon | Go back and drill bonds to 10 and 20 first |
| Only practising forwards (3×4 but not 12÷3) | Teaching in one direction | Always pair multiplication and division facts |
| Relying on fingers too long | No structured strategy taught | Introduce partitioning and bridging methods |
| Forgetting facts under pressure | Lack of timed practice | Use short, low-stakes timed drills regularly |
| Inconsistent practice | No routine | Build a 5-minute daily habit |
| Anxiety around speed | Too much pressure too early | Focus on accuracy first, then build speed gradually |
| Skipping harder tables (7s, 8s) | Avoiding difficulty | Dedicate extra time — use games to make it less daunting |
Fun Practice Methods That Actually Work
At Home
- Kitchen maths: Ask children to double a recipe or work out how many items are in multiple packets
- Board games: Snakes and Ladders, dominoes, and card games all build number fluency naturally
- Car journeys: Spot number plates and make calculations from the digits
- Flashcard races: Beat your own score from yesterday — no competition needed
In the Classroom
- Maths meetings: A daily 5-minute oral starter — ask rapid-fire questions as a class warm-up
- Relay races: Teams answer questions on whiteboards — the speed and energy makes it memorable
- Pair drills: One child asks, one answers, then swap — builds both confidence and fluency
- Target boards: Display a 4×4 grid of numbers and call out operations to hit
Real-Life Applications
| Skill | Real-Life Use |
|---|---|
| Addition/subtraction | Shopping, counting change |
| Multiplication | Working out quantities, costs |
| Division | Sharing equally, recipes |
| Rounding | Estimating journey time |
Practise This Skill Using Hit the Button
One of the best tools for building mental maths speed is Hit the Button — a fast-paced, interactive maths game used by thousands of UK primary schools.
How it works: A question appears on screen. You have seconds to hit the correct answer. Miss it and the next one comes. The clock is ticking.
Why it’s so effective:
- Speed: The time pressure trains your brain to recall facts faster — not through stress, but through repetition
- Accuracy: You quickly learn which facts you know and which need more work
- Confidence: Seeing your score improve over sessions gives children real, measurable progress
- Coverage: Hit the Button maths covers number bonds, times tables, doubling, halving, division facts, and square numbers — all the core mental maths skills
Hit the Button times tables mode is particularly popular because children can target exactly the table they’re working on — perfect for focused revision before a test.
Whether you’re a parent looking for something engaging after school, or a teacher needing a reliable warm-up activity, Hit the Button is one of the most trusted maths practice tools available.
Try Hit the Button on our site and see how many you can get right in 60 seconds.
Practice Questions
Try these — answers are at the bottom. No peeking!
Level 1 (KS1)
- 6 + 4 = ?
- 10 − 3 = ?
- Double 7 = ?
- 5 × 2 = ?
Level 2 (KS2 — Lower) 5. 34 + 27 = ? 6. 9 × 6 = ? 7. Half of 48 = ? 8. 63 − 28 = ?
Level 3 (KS2 — Upper) 9. 7 × 8 = ? 10. 144 ÷ 12 = ? 11. 25% of 80 = ? 12. 6² = ?
Answers:
- 10 | 2. 7 | 3. 14 | 4. 10 | 5. 61 | 6. 54 | 7. 24 | 8. 35 | 9. 56 | 10. 12 | 11. 20 | 12. 36
Expert Tips for Parents and Teachers
For Parents:
- Little and often beats long sessions. Five minutes daily is worth more than one hour on the weekend
- Praise effort, not just answers. “You really thought about that one” beats “Well done, you got it right”
- Never show panic about maths yourself. Children absorb adult attitudes. If you say “I was rubbish at maths,” they may believe they will be too
- Play games rather than drill sheets when motivation is low — both build the same skills
- Track progress visually — a simple chart on the fridge showing improving scores works wonders for motivation
For Teachers:
- Use retrieval practice — short, low-stakes quizzes outperform longer revision blocks for memory retention (this is backed by cognitive science research)
- Vary the format — spoken, written, digital, physical. The more varied the input, the stronger the memory
- Mix old and new facts — don’t just practise the table you taught this week. Revisit previous facts constantly
- Target individual gaps — use tools like Hit the Button to identify which specific facts a child is slow on, then focus practice there
- Model your thinking aloud — when you solve a mental maths problem in front of the class, narrate each step. This teaches strategy, not just answers
Advanced Insight: Why Some Children Struggle and How to Change That
Here’s something most guides don’t mention: mental maths difficulty is rarely about intelligence. It’s almost always about working memory load and strategy gaps.
When a child tries to calculate 47 + 38 without a strategy, their working memory gets overwhelmed — they’re trying to hold too many numbers at once. The result is errors, frustration, and avoidance.
The fix isn’t more practice of the same thing. It’s teaching a strategy that reduces cognitive load.
This is why partitioning (breaking 47 into 40 + 7) works so well. It turns one hard problem into two easy ones.
Researchers in educational psychology call this chunking — grouping information into manageable units so the brain doesn’t have to work as hard.
The same principle applies to times tables. A child who “just knows” 6 × 7 = 42 isn’t smarter than one who counts up in 6s. They’ve simply had enough practice that the fact has moved from working memory into long-term memory. That’s a rehearsal problem, not an ability problem.
Key insight for teaching: Every child can build strong mental maths. The question is always: have they had the right strategies and enough varied practice?
Tools like Hit the Button directly target this — the game is specifically designed to move facts from “effortful recall” to “automatic recall” through repeated, engaging practice.
FAQ
What age should children start mental maths practice? Mental maths begins in Reception with simple counting and number recognition. Formal strategies like number bonds start in Year 1 (ages 5–6). The earlier the foundations are built, the easier everything else becomes.
How often should children practise mental maths? Ideally five minutes every day. Short, consistent practice beats long occasional sessions for memory retention. Even a few questions at breakfast makes a difference.
What does “Hit the Button” cover in maths? Hit the Button maths covers number bonds (to 10, 20, and 100), times tables (1–12), division facts, doubling, halving, and square numbers. It’s suitable for KS1 and KS2 children.
My child knows their tables but is still slow — why? Knowing a fact and retrieving it quickly under pressure are two different skills. Speed comes with repeated recall practice. Timed games like Hit the Button times tables help bridge this gap.
Is there a difference between mental maths and arithmetic? Arithmetic refers to any calculation using the four operations (+, −, ×, ÷). Mental maths is arithmetic done in your head, without writing or a calculator. All mental maths involves arithmetic, but not all arithmetic is mental.
How can I tell if my child is making progress? Track scores on games like Hit the Button over time. Also notice whether they can answer questions more quickly and with less hesitation in everyday situations — that’s the real measure of fluency.
What if my child finds mental maths really stressful? Start with low-pressure games rather than timed tests. Remove the scoring element initially. Build confidence on easier facts first, then reintroduce time pressure gently once accuracy is solid.
Conclusion: Confidence Comes From Consistent Practice
Mental maths isn’t a talent — it’s a habit.
Children who are strong at mental maths got there because they practised regularly, learned the right strategies, and had the confidence to keep trying.
The good news? You now have a complete roadmap. Start with number bonds, build times tables gradually, use tricks and shortcuts, avoid the common mistakes, and make practice part of the daily routine.
And when you want something engaging that children will actually want to do again tomorrow — give Hit the Button a go. It’s one of the most effective maths practice tools available for KS1 and KS2, and it’s right here on this site.
You can also explore related skills like number bonds, times tables, doubling and halving, and division facts — all of which link directly to the mental maths strategies covered in this guide.
Five minutes a day. Consistent practice. Real results.
Start today — hit the button and see how far you can go.
