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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 318 · 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.Double 96 =
  2. 2.1 + 2 + 3 + … + 66 =
  3. 3.1 + 2 + 3 + … + 28 =
  4. 4.Take 26 and take away the sum of its digits. What do you get?
  5. 5.9 × 4 = ?6 — what is the missing digit?
  6. 6.68 × 100 =
  7. 7.37 × 6 =
  8. 8.A girl is 10 years old and her brother is 5 years older. How old will her brother be in 5 years?
  9. 9.1 + 2 + 3 + … + 80 =
  10. 10.20 × 100 =
  11. 11.9 × 1 =
  12. 12.3?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.What comes next? 1, 4, 7, 10, ? (a) 10 (b) 16 (c) 13 (d) 14
  14. 14.123456 × 8 + 6 =
  15. 15.What comes next? 8, 16, 24, 32, ? (a) 48 (b) 40 (c) 32 (d) 41
  16. 16.I thought of a number, multiplied it by 3 and added 3. I got 9. What was my number?
  17. 17.In 2 years a boy will be 13 years old. How old was he 5 years ago?
  18. 18.Double 93 =
  19. 19.17 × 4 =
  20. 20.9 × 5 =
  21. 21.The ages of two twins add up to 12. How old is each twin?
  22. 22.1 × 9 =
  23. 23.12 × 4 =
  24. 24.10 × 9 =
  25. 25.5 × 9 =
  26. 26.Do the 1089 trick with 386: reverse and subtract, then reverse that answer and add. What do you get?
  27. 27.33 × 4 =
  28. 28.9 × 8 = 7? — what is the missing digit?
  29. 29.The 2nd of a month is a Thursday. What day is the 28th of the same month? (a) Wednesday (b) Monday (c) Tuesday (d) Friday
  30. 30.Take 36 and take away the sum of its digits. What do you get?
  31. 31.A girl is 5 years old and her brother is 2 years older. How old will her brother be in 8 years?
  32. 32.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 17 (c) 12 (d) 16
  33. 33.If today is Thursday, what day was it 39 days ago? (a) Sunday (b) Saturday (c) Wednesday (d) Monday
  34. 34.A father is 33 years old and his son is 9. How old was the father when the son was born?
  35. 35.Magic square (every row, column and diagonal has the same total): 18 15 30 | 33 ? 9 | 12 27 24. What is the missing number?
  36. 36.1 + 3 + 5 + … + 35 =
  37. 37.1234567 × 8 + 7 =
  38. 38.A girl is 5 years old and her brother is 4 years older. How old will her brother be in 6 years?
  39. 39.Think of 8. Multiply it by 5, then add 5. What number do you end with?
  40. 40.1111 × 1111 =

Answer key

  1. 192
  2. 2211
  3. 406
  4. 18
  5. 3
  6. 6800
  7. 222
  8. 20
  9. 3240
  10. 2000
  11. 9
  12. 7
  13. 13
  14. 987654
  15. 40
  16. 2
  17. 6
  18. 186
  19. 68
  20. 45
  21. 6
  22. 9
  23. 48
  24. 90
  25. 45
  26. 1089
  27. 132
  28. 2
  29. Tuesday
  30. 27
  31. 15
  32. 16
  33. Sunday
  34. 24
  35. 21
  36. 324
  37. 9876543
  38. 15
  39. 45
  40. 1234321

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