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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 369 · 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. 1.9 × 5 = 4? — what is the missing digit?
  2. 2.?589 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  3. 3.9 × 4 =
  4. 4.Think of 2. Multiply it by 2, then add 7. What number do you end with?
  5. 5.12345679 × 36 =
  6. 6.Magic square (every row, column and diagonal has the same total): 9 23 13 | 19 ? 11 | 17 7 21. What is the missing number?
  7. 7.37 × 18 =
  8. 8.9 × 4 = 3? — what is the missing digit?
  9. 9.10 × 9 =
  10. 10.8 × 9 =
  11. 11.Magic square (every row, column and diagonal has the same total): ? 11 6 | 9 7 5 | 8 3 10. What is the missing number?
  12. 12.3 × 9 =
  13. 13.Do the 1089 trick with 760: reverse and subtract, then reverse that answer and add. What do you get?
  14. 14.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 66 (c) 64 (d) 65
  15. 15.Double 74 =
  16. 16.284 × 10 =
  17. 17.Magic square (every row, column and diagonal has the same total): 10 5 12 | 11 ? 7 | 6 13 8. What is the missing number?
  18. 18.6 × 9 =
  19. 19.What comes next? 18, 26, 34, 42, ? (a) 42 (b) 50 (c) 51 (d) 58
  20. 20.123 × 9 + 4 =
  21. 21.If today is Thursday, what day was it 17 days ago? (a) Tuesday (b) Thursday (c) Monday (d) Sunday
  22. 22.1 + 2 + 3 + … + 12 =
  23. 23.Magic square (every row, column and diagonal has the same total): 14 16 6 | 4 12 ? | 18 8 10. What is the missing number?
  24. 24.9 × 3 = 2? — what is the missing digit?
  25. 25.65 × 100 =
  26. 26.56?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.If today is Monday, what day was it 31 days ago? (a) Saturday (b) Friday (c) Monday (d) Thursday
  28. 28.55 × 4 =
  29. 29.792 + 297 =
  30. 30.50 × 4 =
  31. 31.32 × 4 =
  32. 32.37 × 9 =
  33. 33.12345679 × 54 =
  34. 34.1 + 3 + 5 + … + 37 =
  35. 35.If today is Wednesday, what day was it 23 days ago? (a) Thursday (b) Sunday (c) Monday (d) Tuesday
  36. 36.Double 78 =
  37. 37.Magic square (every row, column and diagonal has the same total): 7 ? 13 | 22 16 10 | 19 4 25. What is the missing number?
  38. 38.1 + 3 + 5 + … + 9 =
  39. 39.9 × 7 = 6? — what is the missing digit?
  40. 40.1 + 2 + 3 + … + 47 =

Answer key

  1. 5
  2. 5
  3. 36
  4. 11
  5. 444444444
  6. 15
  7. 666
  8. 6
  9. 90
  10. 72
  11. 4
  12. 27
  13. 1089
  14. 64
  15. 148
  16. 2840
  17. 9
  18. 54
  19. 50
  20. 1111
  21. Monday
  22. 78
  23. 20
  24. 7
  25. 6500
  26. 7
  27. Friday
  28. 220
  29. 1089
  30. 200
  31. 128
  32. 333
  33. 666666666
  34. 361
  35. Monday
  36. 156
  37. 28
  38. 25
  39. 3
  40. 1128

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