🧮 Maths games · free, no sign-up
Mental maths tricks: learn it, then use it.
Play Mental Maths Tricks Trainer
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How to play Mental Maths Tricks Trainer
- Pick a trick.
- Read the trick card above each question.
- Answer the question. The explanation shows how the trick gives the answer.
- Reach 100 to master the trick.
Tips and strategy
- Say the trick in your own words before you answer.
- Check a trick against a calculation you know: 12 × 11 = 132 and 1 + 2 = 3 in the middle.
- Tricks help, but understanding why they work (and times tables) matters most.
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FAQ
Mental Maths Tricks Trainer: questions
What is the easiest mental maths trick?
Multiplying by 10 (add a zero) and by 5 (halve, then multiply by 10) are the easiest. Then try ×9 as ×10 minus the number.
How do you multiply by 11 quickly?
For a two-digit number, add its digits and put the sum between them: 23 × 11 = 2 (2 + 3) 3 = 253. If the sum is 10 or more, carry the 1.
How do you square a number that ends in 5?
Take the digits before the 5 (call it n), work out n × (n + 1) and write 25 after it. For 65², 6 × 7 = 42, so the answer is 4225.
How do I know if a number divides by 3?
Add its digits. If the total divides by 3, so does the number. The same works for 9.
Do these tricks work for every number?
Each trick works for every number of the kind it describes, for example the ×11 trick works for every two-digit number. Check the trick card for what it covers.
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