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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 162 · 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.Take 310. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  2. 2.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 9 years?
  3. 3.4 × 9 =
  4. 4.Half of 88 =
  5. 5.A girl is 5 years old and her brother is 3 years older. How old will her brother be in 8 years?
  6. 6.Do the 1089 trick with 145: reverse and subtract, then reverse that answer and add. What do you get?
  7. 7.Double 37 =
  8. 8.36 × 4 =
  9. 9.Take 851. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  10. 10.The ages of two twins add up to 20. How old is each twin?
  11. 11.9 × 8 = ?2 — what is the missing digit?
  12. 12.1234567 × 9 + 8 =
  13. 13.5 × 9 =
  14. 14.A girl is 7 years old and her brother is 6 years older. How old will her brother be in 8 years?
  15. 15.12345679 × 36 =
  16. 16.15 × ? = 15000
  17. 17.9 × 5 = 4? — what is the missing digit?
  18. 18.?335 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Think of 2. Multiply it by 4, then add 4. What number do you end with?
  20. 20.Magic square (every row, column and diagonal has the same total): ? 5 15 | 9 13 17 | 11 21 7. What is the missing number?
  21. 21.Magic square (every row, column and diagonal has the same total): 2 9 4 | ? 5 3 | 6 1 8. What is the missing number?
  22. 22.8 × ? = 800
  23. 23.1 + 3 + 5 + … + 9 =
  24. 24.1 + 2 + 3 + … + 78 =
  25. 25.1234567 × 8 + 7 =
  26. 26.2?29 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.12 × ? = 1200
  28. 28.12345679 × 81 =
  29. 29.22 × 4 =
  30. 30.7 × 4 =
  31. 31.9 × 2 = ?8 — what is the missing digit?
  32. 32.Magic square (every row, column and diagonal has the same total): 16 ? 10 | 13 19 25 | 28 7 22. What is the missing number?
  33. 33.1 + 2 + 3 + … + 14 =
  34. 34.What comes next? 11, 18, 25, 32, ? (a) 39 (b) 32 (c) 46 (d) 40
  35. 35.Half of 102 =
  36. 36.Magic trick! Think of 6. Double it, add 16, halve it, then take away 6. What number do you get?
  37. 37.The ages of two twins add up to 22. How old is each twin?
  38. 38.The 5th of a month is a Monday. What day is the 18th of the same month? (a) Wednesday (b) Saturday (c) Monday (d) Sunday
  39. 39.103 × 10 =
  40. 40.What comes next? 11, 15, 19, 23, ? (a) 23 (b) 31 (c) 28 (d) 27

Answer key

  1. 297
  2. 17
  3. 36
  4. 44
  5. 16
  6. 1089
  7. 74
  8. 144
  9. 693
  10. 10
  11. 7
  12. 11111111
  13. 45
  14. 21
  15. 444444444
  16. 1000
  17. 5
  18. 7
  19. 12
  20. 19
  21. 7
  22. 100
  23. 25
  24. 3081
  25. 9876543
  26. 5
  27. 100
  28. 999999999
  29. 88
  30. 28
  31. 1
  32. 31
  33. 105
  34. 39
  35. 51
  36. 8
  37. 11
  38. Sunday
  39. 1030
  40. 27

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