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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 799 · 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 × 1000 =
  2. 2.1 + 3 + 5 + … + 39 =
  3. 3.Double 93 =
  4. 4.1234 × 8 + 4 =
  5. 5.A father is 42 years old and his son is 8. How old was the father when the son was born?
  6. 6.A girl is 7 years old and her brother is 3 years older. How old will her brother be in 8 years?
  7. 7.What comes next? 20, 26, 32, 38, ? (a) 44 (b) 45 (c) 50 (d) 38
  8. 8.2 × 9 =
  9. 9.123 × 8 + 3 =
  10. 10.Take 35 and take away the sum of its digits. What do you get?
  11. 11.4 × 9 =
  12. 12.3 × 9 =
  13. 13.What comes next? 7, 13, 19, 25, ? (a) 32 (b) 25 (c) 31 (d) 37
  14. 14.If today is Monday, what day was it 39 days ago? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
  15. 15.86 × 100 =
  16. 16.297 + 792 =
  17. 17.Take 54 and take away the sum of its digits. What do you get?
  18. 18.1 + 2 + 3 + … + 98 =
  19. 19.9 × 2 = ?8 — what is the missing digit?
  20. 20.12345679 × 81 =
  21. 21.38 × ? = 38000
  22. 22.38 × 4 =
  23. 23.1 + 2 + 3 + … + 83 =
  24. 24.1 + 3 + 5 + … + 17 =
  25. 25.Take 67 and take away the sum of its digits. What do you get?
  26. 26.594 + 495 =
  27. 27.Double 71 =
  28. 28.33 × ? = 3300
  29. 29.Magic square (every row, column and diagonal has the same total): ? 17 10 | 11 13 15 | 16 9 14. What is the missing number?
  30. 30.1 + 2 + 3 + … + 18 =
  31. 31.A girl is 6 years old and her brother is 3 years older. How old will her brother be in 9 years?
  32. 32.11111 × 11111 =
  33. 33.209? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Magic square (every row, column and diagonal has the same total): ? 22 12 | 10 18 26 | 24 14 16. What is the missing number?
  35. 35.58 × 4 =
  36. 36.40 × 1000 =
  37. 37.The ages of two twins add up to 26. How old is each twin?
  38. 38.891 + 198 =
  39. 39.The ages of two twins add up to 28. How old is each twin?
  40. 40.Odd one out: which number is NOT in the 4 times table? (a) 20 (b) 32 (c) 16 (d) 29

Answer key

  1. 27000
  2. 400
  3. 186
  4. 9876
  5. 34
  6. 18
  7. 44
  8. 18
  9. 987
  10. 27
  11. 36
  12. 27
  13. 31
  14. Thursday
  15. 8600
  16. 1089
  17. 45
  18. 4851
  19. 1
  20. 999999999
  21. 1000
  22. 152
  23. 3486
  24. 81
  25. 54
  26. 1089
  27. 142
  28. 100
  29. 12
  30. 171
  31. 18
  32. 123454321
  33. 7
  34. 20
  35. 232
  36. 40000
  37. 13
  38. 1089
  39. 14
  40. 29

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