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Each topic teaches one trick. You see how the trick works, why it is worth knowing and where people usually slip — then practice it right away in a feed you scroll through.
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Multiplying by 5 and 25
- To ×5, multiply by 10 and halve; ×25 is ×100 then ÷4; ×50 is ×100 then ÷2.
- 36·5 in one move: ×10, then halve. What do you get? ×5 = ×10 ÷ 2: 36·10=360, halved = 180.
- Why this trick
- How it works
- Worked examples
- Common mistakes
Mental math course
39 topics in 7 chapters with 1,334 practice questions.
The starter topics are free. The full course is part of MathMe Pro.
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