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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 223 · 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 × 9 =
  2. 2.7 × 4 =
  3. 3.Odd one out: which number is NOT in the 3 times table? (a) 18 (b) 12 (c) 16 (d) 9
  4. 4.31? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.57 × 4 =
  6. 6.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 100 (c) 101 (d) 102
  7. 7.Do the 1089 trick with 994: reverse and subtract, then reverse that answer and add. What do you get?
  8. 8.26?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.9 × 2 = 1? — what is the missing digit?
  10. 10.Magic square (every row, column and diagonal has the same total): 13 6 11 | 8 ? 12 | 9 14 7. What is the missing number?
  11. 11.37 × 6 =
  12. 12.The 4th of a month is a Tuesday. What day is the 22nd of the same month? (a) Sunday (b) Tuesday (c) Friday (d) Saturday
  13. 13.Double 76 =
  14. 14.42 × 4 =
  15. 15.9 × 5 =
  16. 16.Double 71 =
  17. 17.377? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.2 × 1000 =
  19. 19.748 × 10 =
  20. 20.9 × 4 = ?6 — what is the missing digit?
  21. 21.419 × ? = 4190
  22. 22.37 × 1000 =
  23. 23.89 × 100 =
  24. 24.35 × 4 =
  25. 25.Double 59 =
  26. 26.5 × 9 =
  27. 27.In 6 years a boy will be 14 years old. How old was he 3 years ago?
  28. 28.4 × 1000 =
  29. 29.14 × ? = 14000
  30. 30.14 × 4 =
  31. 31.Half of 72 =
  32. 32.48 × 4 =
  33. 33.Magic square (every row, column and diagonal has the same total): 18 4 14 | 8 12 ? | 10 20 6. What is the missing number?
  34. 34.Magic square (every row, column and diagonal has the same total): 13 ? 25 | 28 16 4 | 7 22 19. What is the missing number?
  35. 35.29 × ? = 29000
  36. 36.Magic trick! Think of 18. Double it, add 18, halve it, then take away 18. What number do you get?
  37. 37.A father is 33 years old and his son is 4. How old was the father when the son was born?
  38. 38.123 × 8 + 3 =
  39. 39.A girl is 10 years old and her brother is 3 years older. How old will her brother be in 2 years?
  40. 40.If today is Saturday, what day will it be after 92 days? (a) Monday (b) Saturday (c) Wednesday (d) Sunday

Answer key

  1. 81
  2. 28
  3. 16
  4. 5
  5. 228
  6. 100
  7. 1089
  8. 3
  9. 8
  10. 10
  11. 222
  12. Saturday
  13. 152
  14. 168
  15. 45
  16. 142
  17. 1
  18. 2000
  19. 7480
  20. 3
  21. 10
  22. 37000
  23. 8900
  24. 140
  25. 118
  26. 45
  27. 5
  28. 4000
  29. 1000
  30. 56
  31. 36
  32. 192
  33. 16
  34. 10
  35. 1000
  36. 9
  37. 29
  38. 987
  39. 15
  40. Sunday

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