Maths That You Do in Your Head
Practice mental math strategies and mindsets that make quick calculations reliable and efficient.
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Quiz Questions & Answers
Review every prompt, the correct responses, and helpful context to prep for your own run-through.
Question 1: When multiplying a two-digit number by 11 in your head, which quick method gives the result?
Double the number and append a zero
Multiply first digit by ten and ignore the second
Add the digits and place the sum between them
Question 2: Which mindset most improves speed and accuracy when doing mental arithmetic?
Trying to hold every digit in memory
Chunking problems into simpler parts
Avoiding any written scratch work at all costs
Question 3: To estimate 47 × 52 quickly in your head, which approach gives a fast, accurate estimate?
Multiply exact digits mentally without rounding
Use nearby round numbers: 50×50 = 2500, adjust slightly
Compute 47×100 then divide by two
Question 4: Which technique helps when adding many numbers mentally to avoid cumulative errors?
Always convert to decimals first
Group numbers into pairs that sum to round figures
Add them strictly left to right digitwise
Question 5: When converting 25% of a number in your head, what quick operation yields the answer?
Divide the number by four
Multiply by three then subtract ten percent
Multiply by 0.5 then divide by two
Question 6: Which mental trick helps decide if a product will end in an even number without full multiplication?
Ensure both factors are prime
See if the digits add to an even number
Check whether at least one factor is even
Question 7: For mental subtraction like 1000 − 376, which approach is fastest and least error-prone?
Compute 376−1000 then flip the sign
Convert to negative addition immediately
Subtract in chunks: 1000−300=700, then −70, then −6
Question 8: Which common myth about mental math is false?
Practice improves both speed and accuracy
Estimating is useless compared to exact calculation
You must have a photographic memory to do mental math