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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 227 · 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.Magic square (every row, column and diagonal has the same total): ? 28 7 | 10 16 22 | 25 4 19. What is the missing number?
  2. 2.796 × ? = 7960
  3. 3.I thought of a number, added 3 and then doubled it. I got 22. What was my number?
  4. 4.23 × 4 =
  5. 5.If today is Friday, what day will it be after 58 days? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
  6. 6.Magic square (every row, column and diagonal has the same total): 14 16 6 | 4 12 20 | ? 8 10. What is the missing number?
  7. 7.360 × 10 =
  8. 8.1 + 2 + 3 + … + 37 =
  9. 9.9 × 3 = 2? — what is the missing digit?
  10. 10.Take 970. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  11. 11.297 + 792 =
  12. 12.Half of 64 =
  13. 13.Magic trick! Think of 15. Double it, add 18, halve it, then take away 15. What number do you get?
  14. 14.Double 73 =
  15. 15.In 3 years a boy will be 12 years old. How old was he 5 years ago?
  16. 16.In 4 years a boy will be 12 years old. How old was he 7 years ago?
  17. 17.259 × 10 =
  18. 18.81? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.9 × 6 = 5? — what is the missing digit?
  20. 20.8 × 4 =
  21. 21.9 × 7 = ?3 — what is the missing digit?
  22. 22.37 × 3 =
  23. 23.Double 28 =
  24. 24.24 × 4 =
  25. 25.Half of 196 =
  26. 26.Magic trick! Think of 4. Double it, add 16, halve it, then take away 4. What number do you get?
  27. 27.If today is Tuesday, what day will it be after 21 days? (a) Friday (b) Tuesday (c) Monday (d) Wednesday
  28. 28.Half of 42 =
  29. 29.9 × 3 =
  30. 30.432? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Take 824. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  32. 32.823 × 10 =
  33. 33.If today is Thursday, what day will it be after 68 days? (a) Monday (b) Wednesday (c) Friday (d) Tuesday
  34. 34.17 × 1000 =
  35. 35.What comes next? 4, 8, 16, 32, ? (a) 65 (b) 56 (c) 64 (d) 48
  36. 36.If today is Tuesday, what day will it be after 46 days? (a) Tuesday (b) Saturday (c) Sunday (d) Friday
  37. 37.9 × 10 = ?0 — what is the missing digit?
  38. 38.Magic square (every row, column and diagonal has the same total): 19 ? 31 | 34 22 10 | 13 28 25. What is the missing number?
  39. 39.1 + 2 + 3 + … + 40 =
  40. 40.Think of 8. Multiply it by 5, then add 6. What number do you end with?

Answer key

  1. 13
  2. 10
  3. 8
  4. 92
  5. Sunday
  6. 18
  7. 3600
  8. 703
  9. 7
  10. 891
  11. 1089
  12. 32
  13. 9
  14. 146
  15. 4
  16. 1
  17. 2590
  18. 9
  19. 4
  20. 32
  21. 6
  22. 111
  23. 56
  24. 96
  25. 98
  26. 8
  27. Tuesday
  28. 21
  29. 27
  30. 9
  31. 396
  32. 8230
  33. Tuesday
  34. 17000
  35. 64
  36. Saturday
  37. 9
  38. 16
  39. 820
  40. 46

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