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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 157 · 40 questions
TalentJR

The trick (Choose a trick): × 9 → finger trick; × 4 → double double; × 10, 100, 1000 → slide and add zeros. 37, 12345679 or 111… → magic patterns; reverse and subtract → 1089. Puzzles: find the rule, the total or the leftover days, then check your answer.

NameDateTime takenScore ___ / 40
  1. 1.The ages of two twins add up to 18. How old is each twin?
  2. 2.Magic square (every row, column and diagonal has the same total): 5 10 9 | 12 8 4 | ? 6 11. What is the missing number?
  3. 3.45 × 1000 =
  4. 4.Take 61 and take away the sum of its digits. What do you get?
  5. 5.41 × 4 =
  6. 6.9 × 5 = 4? — what is the missing digit?
  7. 7.123456 × 9 + 7 =
  8. 8.If today is Monday, what day will it be after 62 days? (a) Monday (b) Sunday (c) Saturday (d) Wednesday
  9. 9.Magic square (every row, column and diagonal has the same total): 9 14 13 | 16 12 8 | 11 10 ?. What is the missing number?
  10. 10.The 2nd of a month is a Sunday. What day is the 11th of the same month? (a) Wednesday (b) Monday (c) Friday (d) Tuesday
  11. 11.Take 35 and take away the sum of its digits. What do you get?
  12. 12.Magic square (every row, column and diagonal has the same total): 26 29 ? | 11 23 35 | 32 17 20. What is the missing number?
  13. 13.Odd one out: which number is NOT in the 7 times table? (a) 14 (b) 43 (c) 28 (d) 42
  14. 14.Take 72 and take away the sum of its digits. What do you get?
  15. 15.I thought of a number, multiplied it by 3 and added 7. I got 19. What was my number?
  16. 16.Magic trick! Think of 14. Double it, add 12, halve it, then take away 14. What number do you get?
  17. 17.4 × 9 =
  18. 18.1 + 2 + 3 + … + 85 =
  19. 19.90 × 100 =
  20. 20.1 + 3 + 5 + … + 39 =
  21. 21.9 × 8 =
  22. 22.A piggy bank has 6 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  23. 23.843 × 10 =
  24. 24.1 + 2 + 3 + … + 25 =
  25. 25.1 + 3 + 5 + … + 15 =
  26. 26.44 × 4 =
  27. 27.What comes next? 11, 14, 17, 20, ? (a) 26 (b) 23 (c) 24 (d) 20
  28. 28.1 + 2 + 3 + … + 33 =
  29. 29.79?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.If today is Monday, what day was it 31 days ago? (a) Thursday (b) Friday (c) Saturday (d) Monday
  31. 31.What comes next? 4, 13, 22, 31, ? (a) 41 (b) 31 (c) 40 (d) 49
  32. 32.Magic square (every row, column and diagonal has the same total): ? 4 5 | 2 6 10 | 7 8 3. What is the missing number?
  33. 33.1 + 3 + 5 + … + 45 =
  34. 34.9 × 7 =
  35. 35.Magic trick! Think of 6. Double it, add 14, halve it, then take away 6. What number do you get?
  36. 36.The ages of two twins add up to 16. How old is each twin?
  37. 37.Double 74 =
  38. 38.Odd one out: which number is NOT in the 5 times table? (a) 10 (b) 32 (c) 20 (d) 30
  39. 39.9 × 3 = ?7 — what is the missing digit?
  40. 40.5 × 9 =

Answer key

  1. 9
  2. 7
  3. 45000
  4. 54
  5. 164
  6. 5
  7. 1111111
  8. Sunday
  9. 15
  10. Tuesday
  11. 27
  12. 14
  13. 43
  14. 63
  15. 4
  16. 6
  17. 36
  18. 3655
  19. 9000
  20. 400
  21. 72
  22. 36
  23. 8430
  24. 325
  25. 64
  26. 176
  27. 23
  28. 561
  29. 5
  30. Friday
  31. 40
  32. 9
  33. 529
  34. 63
  35. 7
  36. 8
  37. 148
  38. 32
  39. 2
  40. 45

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