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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 51 · 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. 1.58 × 4 =
  2. 2.396 + 693 =
  3. 3.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 36 (c) 49 (d) 42
  4. 4.95 × 100 =
  5. 5.12 × 8 + 2 =
  6. 6.Double 51 =
  7. 7.?832 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.25 × 4 =
  9. 9.73 × 100 =
  10. 10.9 × 10 = 9? — what is the missing digit?
  11. 11.Magic square (every row, column and diagonal has the same total): ? 11 14 | 5 17 29 | 20 23 8. What is the missing number?
  12. 12.The 1st of a month is a Wednesday. What day is the 17th of the same month? (a) Monday (b) Saturday (c) Thursday (d) Friday
  13. 13.?457 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Half of 102 =
  15. 15.If today is Tuesday, what day was it 56 days ago? (a) Tuesday (b) Friday (c) Wednesday (d) Monday
  16. 16.Double 68 =
  17. 17.30 × 1000 =
  18. 18.What comes next? 2, 4, 6, 8, ? (a) 10 (b) 12 (c) 8 (d) 11
  19. 19.I thought of a number, multiplied it by 4 and added 5. I got 57. What was my number?
  20. 20.In 5 years a boy will be 14 years old. How old was he 3 years ago?
  21. 21.16 × 4 =
  22. 22.If today is Monday, what day will it be after 86 days? (a) Thursday (b) Wednesday (c) Saturday (d) Tuesday
  23. 23.9 × 10 =
  24. 24.Take 199. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  25. 25.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 60 (c) 81 (d) 80
  26. 26.Half of 42 =
  27. 27.37 × 6 =
  28. 28.19 × 4 =
  29. 29.Double 26 =
  30. 30.Odd one out: which number is NOT in the 8 times table? (a) 35 (b) 32 (c) 64 (d) 56
  31. 31.297 + 792 =
  32. 32.Magic square (every row, column and diagonal has the same total): 6 13 ? | 11 9 7 | 10 5 12. What is the missing number?
  33. 33.Magic trick! Think of 6. Double it, add 10, halve it, then take away 6. What number do you get?
  34. 34.I thought of a number, multiplied it by 4 and added 7. I got 15. What was my number?
  35. 35.37 × 27 =
  36. 36.25 × 1000 =
  37. 37.Magic square (every row, column and diagonal has the same total): 13 8 15 | 14 ? 10 | 9 16 11. What is the missing number?
  38. 38.54 × 4 =
  39. 39.Magic square (every row, column and diagonal has the same total): 9 30 15 | ? 18 12 | 21 6 27. What is the missing number?
  40. 40.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 12 (c) 17 (d) 16

Answer key

  1. 232
  2. 1089
  3. 48
  4. 9500
  5. 98
  6. 102
  7. 5
  8. 100
  9. 7300
  10. 0
  11. 26
  12. Friday
  13. 2
  14. 51
  15. Tuesday
  16. 136
  17. 30000
  18. 10
  19. 13
  20. 6
  21. 64
  22. Wednesday
  23. 90
  24. 792
  25. 80
  26. 21
  27. 222
  28. 76
  29. 52
  30. 35
  31. 1089
  32. 8
  33. 5
  34. 2
  35. 999
  36. 25000
  37. 12
  38. 216
  39. 24
  40. 16

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