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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 516 · 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. 1.9 × 8 = 7? — what is the missing digit?
  2. 2.What comes next? 8, 11, 14, 17, ? (a) 21 (b) 20 (c) 23 (d) 17
  3. 3.26 × 4 =
  4. 4.9 × 4 = 3? — what is the missing digit?
  5. 5.10 × 9 =
  6. 6.Magic square (every row, column and diagonal has the same total): 7 8 3 | 2 6 10 | ? 4 5. What is the missing number?
  7. 7.Double 25 =
  8. 8.If today is Saturday, what day will it be after 73 days? (a) Tuesday (b) Friday (c) Wednesday (d) Monday
  9. 9.1 × 9 =
  10. 10.Magic square (every row, column and diagonal has the same total): 19 5 15 | 9 13 17 | ? 21 7. What is the missing number?
  11. 11.674 × ? = 6740
  12. 12.9 × 5 = ?5 — what is the missing digit?
  13. 13.Half of 196 =
  14. 14.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 64 (c) 62 (d) 65
  15. 15.Magic square (every row, column and diagonal has the same total): 11 32 ? | 26 20 14 | 23 8 29. What is the missing number?
  16. 16.The 5th of a month is a Monday. What day is the 15th of the same month? (a) Wednesday (b) Sunday (c) Friday (d) Thursday
  17. 17.9 × 2 = 1? — what is the missing digit?
  18. 18.Magic square (every row, column and diagonal has the same total): ? 26 12 | 14 18 22 | 24 10 20. What is the missing number?
  19. 19.I thought of a number, multiplied it by 3 and added 1. I got 43. What was my number?
  20. 20.47 × 1000 =
  21. 21.Take 16 and take away the sum of its digits. What do you get?
  22. 22.A father is 30 years old and his son is 11. How old was the father when the son was born?
  23. 23.In 6 years a boy will be 20 years old. How old was he 4 years ago?
  24. 24.45 × 4 =
  25. 25.1 + 2 + 3 + … + 16 =
  26. 26.9 × 7 = ?3 — what is the missing digit?
  27. 27.Take 32 and take away the sum of its digits. What do you get?
  28. 28.Double 59 =
  29. 29.1 + 2 + 3 + … + 8 =
  30. 30.Think of 13. Multiply it by 3, then add 4. What number do you end with?
  31. 31.9 × 7 = 6? — what is the missing digit?
  32. 32.12345679 × 54 =
  33. 33.Double 27 =
  34. 34.Magic square (every row, column and diagonal has the same total): 24 9 30 | 27 21 15 | 12 33 ?. What is the missing number?
  35. 35.If today is Saturday, what day will it be after 29 days? (a) Sunday (b) Wednesday (c) Saturday (d) Monday
  36. 36.Magic square (every row, column and diagonal has the same total): 24 9 ? | 3 15 27 | 18 21 6. What is the missing number?
  37. 37.1 + 2 + 3 + … + 20 =
  38. 38.1?98 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.22?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.In 6 years a boy will be 18 years old. How old was he 3 years ago?

Answer key

  1. 2
  2. 20
  3. 104
  4. 6
  5. 90
  6. 9
  7. 50
  8. Tuesday
  9. 9
  10. 11
  11. 10
  12. 4
  13. 98
  14. 64
  15. 17
  16. Thursday
  17. 8
  18. 16
  19. 14
  20. 47000
  21. 9
  22. 19
  23. 10
  24. 180
  25. 136
  26. 6
  27. 27
  28. 118
  29. 36
  30. 43
  31. 3
  32. 666666666
  33. 54
  34. 18
  35. Sunday
  36. 12
  37. 210
  38. 9
  39. 4
  40. 9

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