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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 499 · 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 × 10 = ?0 — what is the missing digit?
  2. 2.If today is Wednesday, what day will it be after 30 days? (a) Friday (b) Monday (c) Thursday (d) Saturday
  3. 3.Magic square (every row, column and diagonal has the same total): 33 12 27 | 18 24 30 | 21 36 ?. What is the missing number?
  4. 4.51 × ? = 5100
  5. 5.9 × 4 = ?6 — what is the missing digit?
  6. 6.6 × 9 =
  7. 7.9 × 3 =
  8. 8.635 × ? = 6350
  9. 9.Half of 36 =
  10. 10.9 × 5 = 4? — what is the missing digit?
  11. 11.Odd one out: which number is NOT in the 6 times table? (a) 54 (b) 36 (c) 24 (d) 32
  12. 12.46 × 4 =
  13. 13.693 + 396 =
  14. 14.1 + 2 + 3 + … + 19 =
  15. 15.9 × 4 = 3? — what is the missing digit?
  16. 16.Half of 132 =
  17. 17.8 × 9 =
  18. 18.If today is Tuesday, what day was it 45 days ago? (a) Saturday (b) Tuesday (c) Friday (d) Sunday
  19. 19.15 × 4 =
  20. 20.3 × 9 =
  21. 21.1 + 2 + 3 + … + 76 =
  22. 22.9 × 10 =
  23. 23.?230 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Half of 22 =
  25. 25.840 × 10 =
  26. 26.In 4 years a boy will be 13 years old. How old was he 3 years ago?
  27. 27.9 × 7 =
  28. 28.57?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  29. 29.2 × 9 =
  30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  31. 31.12345679 × 81 =
  32. 32.Half of 98 =
  33. 33.Magic square (every row, column and diagonal has the same total): 20 22 12 | 10 18 ? | 24 14 16. What is the missing number?
  34. 34.A father is 35 years old and his son is 10. How old was the father when the son was born?
  35. 35.A father is 42 years old and his son is 13. How old was the father when the son was born?
  36. 36.1 + 2 + 3 + … + 55 =
  37. 37.Double 42 =
  38. 38.If today is Monday, what day was it 22 days ago? (a) Monday (b) Sunday (c) Saturday (d) Wednesday
  39. 39.57 × 4 =
  40. 40.9 × 2 = ?8 — what is the missing digit?

Answer key

  1. 9
  2. Friday
  3. 15
  4. 100
  5. 3
  6. 54
  7. 27
  8. 10
  9. 18
  10. 5
  11. 32
  12. 184
  13. 1089
  14. 190
  15. 6
  16. 66
  17. 72
  18. Saturday
  19. 60
  20. 27
  21. 2926
  22. 90
  23. 4
  24. 11
  25. 8400
  26. 6
  27. 63
  28. 2
  29. 18
  30. 693
  31. 999999999
  32. 49
  33. 26
  34. 25
  35. 29
  36. 1540
  37. 84
  38. Sunday
  39. 228
  40. 1

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