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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 92 · 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 4th of a month is a Sunday. What day is the 20th of the same month? (a) Friday (b) Monday (c) Wednesday (d) Tuesday
  2. 2.42 × 4 =
  3. 3.9 × 3 =
  4. 4.Half of 194 =
  5. 5.1 + 2 + 3 + … + 10 =
  6. 6.9 × 7 = 6? — what is the missing digit?
  7. 7.60 × 4 =
  8. 8.42 × 1000 =
  9. 9.616? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.9 × 3 = ?7 — what is the missing digit?
  11. 11.What comes next? 16, 24, 32, 40, ? (a) 56 (b) 48 (c) 49 (d) 40
  12. 12.35? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Take 89 and take away the sum of its digits. What do you get?
  14. 14.Magic square (every row, column and diagonal has the same total): 6 27 12 | 21 ? 9 | 18 3 24. What is the missing number?
  15. 15.A father is 34 years old and his son is 5. How old was the father when the son was born?
  16. 16.A father is 43 years old and his son is 5. How old was the father when the son was born?
  17. 17.1 + 3 + 5 + … + 11 =
  18. 18.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 102 (c) 100 (d) 101
  19. 19.Double 81 =
  20. 20.12 × 8 + 2 =
  21. 21.18 × 4 =
  22. 22.798 × 10 =
  23. 23.Half of 74 =
  24. 24.I thought of a number, multiplied it by 4 and added 9. I got 21. What was my number?
  25. 25.Double 26 =
  26. 26.36 × 4 =
  27. 27.12345 × 9 + 6 =
  28. 28.What comes next? 4, 8, 16, 32, ? (a) 65 (b) 56 (c) 64 (d) 48
  29. 29.Magic square (every row, column and diagonal has the same total): 5 4 9 | 10 6 2 | ? 8 7. What is the missing number?
  30. 30.Magic square (every row, column and diagonal has the same total): ? 5 12 | 11 9 7 | 6 13 8. What is the missing number?
  31. 31.The ages of two twins add up to 26. How old is each twin?
  32. 32.Think of 4. Multiply it by 2, then add 2. What number do you end with?
  33. 33.276 × 10 =
  34. 34.Double 94 =
  35. 35.I thought of a number, added 3 and then doubled it. I got 44. What was my number?
  36. 36.Double 41 =
  37. 37.Double 99 =
  38. 38.49 × 1000 =
  39. 39.37 × ? = 3700
  40. 40.398 × 10 =

Answer key

  1. Tuesday
  2. 168
  3. 27
  4. 97
  5. 55
  6. 3
  7. 240
  8. 42000
  9. 5
  10. 2
  11. 48
  12. 1
  13. 72
  14. 15
  15. 29
  16. 38
  17. 36
  18. 100
  19. 162
  20. 98
  21. 72
  22. 7980
  23. 37
  24. 3
  25. 52
  26. 144
  27. 111111
  28. 64
  29. 3
  30. 10
  31. 13
  32. 10
  33. 2760
  34. 188
  35. 19
  36. 82
  37. 198
  38. 49000
  39. 100
  40. 3980

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