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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 145 · 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. 1.27 × ? = 270
  2. 2.1 + 2 + 3 + … + 22 =
  3. 3.A girl is 7 years old and her brother is 3 years older. How old will her brother be in 8 years?
  4. 4.Half of 114 =
  5. 5.1 × 9 =
  6. 6.If today is Tuesday, what day will it be after 33 days? (a) Monday (b) Saturday (c) Wednesday (d) Sunday
  7. 7.Double 31 =
  8. 8.Magic square (every row, column and diagonal has the same total): 22 ? 18 | 12 16 20 | 14 24 10. What is the missing number?
  9. 9.1 + 2 + 3 + … + 91 =
  10. 10.12 × 4 =
  11. 11.9 × 3 = 2? — what is the missing digit?
  12. 12.Half of 102 =
  13. 13.1?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.1 + 2 + 3 + … + 100 =
  15. 15.818 × 10 =
  16. 16.Double 56 =
  17. 17.9 × 4 = 3? — what is the missing digit?
  18. 18.I thought of a number, added 6 and then doubled it. I got 22. What was my number?
  19. 19.A girl is 5 years old and her brother is 5 years older. How old will her brother be in 8 years?
  20. 20.10 × 9 =
  21. 21.123456 × 9 + 7 =
  22. 22.951 × 10 =
  23. 23.8 × 9 =
  24. 24.Magic square (every row, column and diagonal has the same total): 9 2 7 | 4 6 8 | 5 ? 3. What is the missing number?
  25. 25.If today is Wednesday, what day will it be after 63 days? (a) Saturday (b) Wednesday (c) Tuesday (d) Thursday
  26. 26.Magic square (every row, column and diagonal has the same total): ? 9 24 | 15 21 27 | 18 33 12. What is the missing number?
  27. 27.I thought of a number, added 7 and then doubled it. I got 46. What was my number?
  28. 28.28 × 4 =
  29. 29.Magic square (every row, column and diagonal has the same total): 23 13 15 | 9 17 ? | 19 21 11. What is the missing number?
  30. 30.If today is Saturday, what day was it 27 days ago? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
  31. 31.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  32. 32.Double 98 =
  33. 33.Half of 166 =
  34. 34.157 × 10 =
  35. 35.12 × 8 + 2 =
  36. 36.21 × 4 =
  37. 37.9 × 1 =
  38. 38.9 × 6 = 5? — what is the missing digit?
  39. 39.I thought of a number, added 1 and then doubled it. I got 8. What was my number?
  40. 40.15 × 4 =

Answer key

  1. 10
  2. 253
  3. 18
  4. 57
  5. 9
  6. Sunday
  7. 62
  8. 8
  9. 4186
  10. 48
  11. 7
  12. 51
  13. 1
  14. 5050
  15. 8180
  16. 112
  17. 6
  18. 5
  19. 18
  20. 90
  21. 1111111
  22. 9510
  23. 72
  24. 10
  25. Wednesday
  26. 30
  27. 16
  28. 112
  29. 25
  30. Sunday
  31. 891
  32. 196
  33. 83
  34. 1570
  35. 98
  36. 84
  37. 9
  38. 4
  39. 3
  40. 60

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