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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 158 · 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.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  2. 2.50 × 1000 =
  3. 3.14 × 4 =
  4. 4.What comes next? 12, 18, 24, 30, ? (a) 36 (b) 42 (c) 37 (d) 30
  5. 5.6 × 4 =
  6. 6.9 × 4 =
  7. 7.Double 11 =
  8. 8.15 × 4 =
  9. 9.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 64 (c) 66 (d) 62
  10. 10.Half of 74 =
  11. 11.1 + 2 + 3 + … + 94 =
  12. 12.I thought of a number, added 1 and then doubled it. I got 12. What was my number?
  13. 13.I thought of a number, added 9 and then doubled it. I got 52. What was my number?
  14. 14.28 × 4 =
  15. 15.47 × 4 =
  16. 16.9 × 2 = 1? — what is the missing digit?
  17. 17.9 × 3 = 2? — what is the missing digit?
  18. 18.8 × 9 =
  19. 19.1 + 2 + 3 + … + 37 =
  20. 20.37 × 4 =
  21. 21.12345679 × 81 =
  22. 22.1 + 2 + 3 + … + 93 =
  23. 23.231 × 10 =
  24. 24.9 × 5 = ?5 — what is the missing digit?
  25. 25.12 × 8 + 2 =
  26. 26.23 × 4 =
  27. 27.If today is Thursday, what day will it be after 18 days? (a) Sunday (b) Thursday (c) Monday (d) Tuesday
  28. 28.Take 50 and take away the sum of its digits. What do you get?
  29. 29.?44 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.6 × 9 =
  31. 31.1 + 2 + 3 + … + 66 =
  32. 32.792 + 297 =
  33. 33.Think of 11. Multiply it by 5, then add 8. What number do you end with?
  34. 34.24 × 4 =
  35. 35.Magic square (every row, column and diagonal has the same total): 20 10 24 | 22 18 14 | ? 26 16. What is the missing number?
  36. 36.A girl is 5 years old and her brother is 2 years older. How old will her brother be in 2 years?
  37. 37.Magic square (every row, column and diagonal has the same total): 17 ? 15 | 12 14 16 | 13 18 11. What is the missing number?
  38. 38.681 × ? = 6810
  39. 39.What comes next? 9, 16, 25, 36, ? (a) 50 (b) 49 (c) 47 (d) 51
  40. 40.12345679 × 9 =

Answer key

  1. 198
  2. 50000
  3. 56
  4. 36
  5. 24
  6. 36
  7. 22
  8. 60
  9. 64
  10. 37
  11. 4465
  12. 5
  13. 17
  14. 112
  15. 188
  16. 8
  17. 7
  18. 72
  19. 703
  20. 148
  21. 999999999
  22. 4371
  23. 2310
  24. 4
  25. 98
  26. 92
  27. Monday
  28. 45
  29. 1
  30. 54
  31. 2211
  32. 1089
  33. 63
  34. 96
  35. 12
  36. 9
  37. 10
  38. 10
  39. 49
  40. 111111111

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