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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 705 · 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 × 3 = ?7 — what is the missing digit?
  2. 2.Magic square (every row, column and diagonal has the same total): 18 15 30 | 33 21 9 | ? 27 24. What is the missing number?
  3. 3.9 × 3 = 2? — what is the missing digit?
  4. 4.40 × 4 =
  5. 5.9 × 2 = ?8 — what is the missing digit?
  6. 6.Magic trick! Think of 14. Double it, add 6, halve it, then take away 14. What number do you get?
  7. 7.1?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.If today is Tuesday, what day was it 36 days ago? (a) Thursday (b) Sunday (c) Monday (d) Tuesday
  9. 9.The 5th of a month is a Wednesday. What day is the 21st of the same month? (a) Saturday (b) Thursday (c) Friday (d) Monday
  10. 10.The 3rd of a month is a Wednesday. What day is the 25th of the same month? (a) Sunday (b) Friday (c) Thursday (d) Wednesday
  11. 11.15 × 4 =
  12. 12.37 × 27 =
  13. 13.47 × 1000 =
  14. 14.9 × 9 =
  15. 15.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 101 (c) 100 (d) 102
  16. 16.Magic square (every row, column and diagonal has the same total): 24 27 ? | 9 21 33 | 30 15 18. What is the missing number?
  17. 17.9 × 5 = ?5 — what is the missing digit?
  18. 18.23 × 10 =
  19. 19.Half of 122 =
  20. 20.634? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.Take 55 and take away the sum of its digits. What do you get?
  22. 22.Double 31 =
  23. 23.If today is Thursday, what day will it be after 78 days? (a) Monday (b) Thursday (c) Saturday (d) Friday
  24. 24.Odd one out: which number is NOT in the 9 times table? (a) 45 (b) 18 (c) 36 (d) 39
  25. 25.37 × 4 =
  26. 26.9 × 8 = ?2 — what is the missing digit?
  27. 27.38?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.Magic square (every row, column and diagonal has the same total): 17 12 13 | 10 14 ? | 15 16 11. What is the missing number?
  29. 29.What comes next? 9, 18, 27, 36, ? (a) 46 (b) 54 (c) 36 (d) 45
  30. 30.Double 92 =
  31. 31.Take 750. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  32. 32.95 × ? = 9500
  33. 33.98 × 100 =
  34. 34.I thought of a number, added 4 and then doubled it. I got 32. What was my number?
  35. 35.In 5 years a boy will be 13 years old. How old was he 3 years ago?
  36. 36.28 × 4 =
  37. 37.451 × ? = 4510
  38. 38.Magic square (every row, column and diagonal has the same total): 9 19 5 | 7 11 15 | 17 ? 13. What is the missing number?
  39. 39.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 16 (c) 17 (d) 14
  40. 40.19 × 4 =

Answer key

  1. 2
  2. 12
  3. 7
  4. 160
  5. 1
  6. 3
  7. 5
  8. Monday
  9. Friday
  10. Thursday
  11. 60
  12. 999
  13. 47000
  14. 81
  15. 100
  16. 12
  17. 4
  18. 230
  19. 61
  20. 5
  21. 45
  22. 62
  23. Friday
  24. 39
  25. 148
  26. 7
  27. 8
  28. 18
  29. 45
  30. 184
  31. 693
  32. 100
  33. 9800
  34. 12
  35. 5
  36. 112
  37. 10
  38. 3
  39. 16
  40. 76

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