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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 424 · 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. 1.1 + 2 + 3 + … + 96 =
  2. 2.What comes next? 18, 21, 24, 27, ? (a) 31 (b) 27 (c) 33 (d) 30
  3. 3.78 × 100 =
  4. 4.123 × 9 + 4 =
  5. 5.A girl is 5 years old and her brother is 2 years older. How old will her brother be in 4 years?
  6. 6.Do the 1089 trick with 601: reverse and subtract, then reverse that answer and add. What do you get?
  7. 7.37 × 3 =
  8. 8.52?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Take 730. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  10. 10.1 + 2 + 3 + … + 67 =
  11. 11.I thought of a number, multiplied it by 4 and added 8. I got 32. What was my number?
  12. 12.Do the 1089 trick with 950: reverse and subtract, then reverse that answer and add. What do you get?
  13. 13.Half of 182 =
  14. 14.9 × 10 = ?0 — what is the missing digit?
  15. 15.A girl is 10 years old and her brother is 4 years older. How old will her brother be in 7 years?
  16. 16.Double 38 =
  17. 17.76 × 10 =
  18. 18.If today is Friday, what day will it be after 15 days? (a) Tuesday (b) Friday (c) Saturday (d) Sunday
  19. 19.812? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.Take 86 and take away the sum of its digits. What do you get?
  21. 21.198 + 891 =
  22. 22.Magic square (every row, column and diagonal has the same total): 14 9 10 | 7 ? 15 | 12 13 8. What is the missing number?
  23. 23.What comes next? 17, 25, 33, 41, ? (a) 49 (b) 50 (c) 57 (d) 41
  24. 24.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 24 (c) 32 (d) 33
  25. 25.41 × 1000 =
  26. 26.Double 83 =
  27. 27.Odd one out: which number is NOT in the 6 times table? (a) 30 (b) 52 (c) 12 (d) 24
  28. 28.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  29. 29.26 × 4 =
  30. 30.1234567 × 9 + 8 =
  31. 31.Double 78 =
  32. 32.46?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.What comes next? 2, 11, 20, 29, ? (a) 38 (b) 39 (c) 47 (d) 29
  34. 34.Odd one out: which number is NOT in the 7 times table? (a) 44 (b) 35 (c) 28 (d) 42
  35. 35.1234 × 8 + 4 =
  36. 36.Magic square (every row, column and diagonal has the same total): 10 24 14 | 20 16 12 | 18 ? 22. What is the missing number?
  37. 37.2?81 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.40 × 4 =
  39. 39.4 × 9 =
  40. 40.?787 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

Answer key

  1. 4656
  2. 30
  3. 7800
  4. 1111
  5. 11
  6. 1089
  7. 111
  8. 2
  9. 693
  10. 2278
  11. 6
  12. 1089
  13. 91
  14. 9
  15. 21
  16. 76
  17. 760
  18. Saturday
  19. 7
  20. 72
  21. 1089
  22. 11
  23. 49
  24. 32
  25. 41000
  26. 166
  27. 52
  28. 198
  29. 104
  30. 11111111
  31. 156
  32. 3
  33. 38
  34. 44
  35. 9876
  36. 8
  37. 7
  38. 160
  39. 36
  40. 5

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