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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 275 · 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.What comes next? 25, 36, 49, 64, ? (a) 82 (b) 81 (c) 79 (d) 83
  2. 2.1 + 3 + 5 + … + 39 =
  3. 3.A girl is 10 years old and her brother is 3 years older. How old will her brother be in 7 years?
  4. 4.39 × 4 =
  5. 5.A girl is 8 years old and her brother is 2 years older. How old will her brother be in 2 years?
  6. 6.42 × 4 =
  7. 7.If today is Sunday, what day will it be after 30 days? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
  8. 8.14 × ? = 14000
  9. 9.5?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.Take 69 and take away the sum of its digits. What do you get?
  11. 11.1 + 2 + 3 + … + 7 =
  12. 12.1 × 9 =
  13. 13.25 × 4 =
  14. 14.594 + 495 =
  15. 15.Magic square (every row, column and diagonal has the same total): 11 12 7 | 6 ? 14 | 13 8 9. What is the missing number?
  16. 16.Magic square (every row, column and diagonal has the same total): 8 1 6 | 3 5 7 | 4 9 ?. What is the missing number?
  17. 17.1 + 3 + 5 + … + 25 =
  18. 18.824 × ? = 8240
  19. 19.9 × 9 =
  20. 20.Magic square (every row, column and diagonal has the same total): ? 23 20 | 29 17 5 | 14 11 26. What is the missing number?
  21. 21.1 + 2 + 3 + … + 67 =
  22. 22.Double 88 =
  23. 23.Think of 11. Multiply it by 2, then add 3. What number do you end with?
  24. 24.Half of 118 =
  25. 25.Double 49 =
  26. 26.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 48 (c) 36 (d) 42
  27. 27.4 × 100 =
  28. 28.334 × 10 =
  29. 29.286 × ? = 2860
  30. 30.9 × 3 =
  31. 31.The 2nd of a month is a Tuesday. What day is the 18th of the same month? (a) Friday (b) Wednesday (c) Thursday (d) Sunday
  32. 32.2 × 9 =
  33. 33.Half of 106 =
  34. 34.Double 67 =
  35. 35.9 × 7 = 6? — what is the missing digit?
  36. 36.If today is Monday, what day will it be after 20 days? (a) Sunday (b) Saturday (c) Wednesday (d) Monday
  37. 37.67 × 100 =
  38. 38.Take 539. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.12345679 × 45 =
  40. 40.48 × 1000 =

Answer key

  1. 81
  2. 400
  3. 20
  4. 156
  5. 12
  6. 168
  7. Tuesday
  8. 1000
  9. 3
  10. 54
  11. 28
  12. 9
  13. 100
  14. 1089
  15. 10
  16. 2
  17. 169
  18. 10
  19. 81
  20. 8
  21. 2278
  22. 176
  23. 25
  24. 59
  25. 98
  26. 48
  27. 400
  28. 3340
  29. 10
  30. 27
  31. Thursday
  32. 18
  33. 53
  34. 134
  35. 3
  36. Sunday
  37. 6700
  38. 396
  39. 555555555
  40. 48000

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