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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 554 · 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 = 2? — what is the missing digit?
  2. 2.9 × 5 = 4? — what is the missing digit?
  3. 3.17 × 1000 =
  4. 4.Double 18 =
  5. 5.24 × 100 =
  6. 6.What comes next? 4, 12, 20, 28, ? (a) 44 (b) 37 (c) 28 (d) 36
  7. 7.59 × 4 =
  8. 8.Double 52 =
  9. 9.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  10. 10.36 × 4 =
  11. 11.50 × 4 =
  12. 12.9 × 2 = ?8 — what is the missing digit?
  13. 13.The 5th of a month is a Wednesday. What day is the 30th of the same month? (a) Wednesday (b) Monday (c) Sunday (d) Saturday
  14. 14.37 × 6 =
  15. 15.12345 × 8 + 5 =
  16. 16.Half of 178 =
  17. 17.1 + 3 + 5 + … + 45 =
  18. 18.104? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.9 × 9 =
  20. 20.I thought of a number, multiplied it by 4 and added 6. I got 54. What was my number?
  21. 21.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 65 (c) 48 (d) 64
  22. 22.12 × 8 + 2 =
  23. 23.431 × 10 =
  24. 24.If today is Thursday, what day was it 20 days ago? (a) Saturday (b) Friday (c) Thursday (d) Monday
  25. 25.A girl is 7 years old and her brother is 4 years older. How old will her brother be in 4 years?
  26. 26.?748 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  27. 27.Take 149. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  28. 28.25 × 4 =
  29. 29.797? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Magic square (every row, column and diagonal has the same total): 32 11 ? | 17 23 29 | 20 35 14. What is the missing number?
  31. 31.The 4th of a month is a Wednesday. What day is the 22nd of the same month? (a) Monday (b) Wednesday (c) Sunday (d) Saturday
  32. 32.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  33. 33.9 × 6 = 5? — what is the missing digit?
  34. 34.9 × 1 =
  35. 35.495 + 594 =
  36. 36.1 + 2 + 3 + … + 14 =
  37. 37.I thought of a number, multiplied it by 4 and added 7. I got 55. What was my number?
  38. 38.8 × 9 =
  39. 39.Half of 32 =
  40. 40.Magic square (every row, column and diagonal has the same total): 31 10 25 | 16 22 28 | ? 34 13. What is the missing number?

Answer key

  1. 7
  2. 5
  3. 17000
  4. 36
  5. 2400
  6. 36
  7. 236
  8. 104
  9. 198
  10. 144
  11. 200
  12. 1
  13. Sunday
  14. 222
  15. 98765
  16. 89
  17. 529
  18. 4
  19. 81
  20. 12
  21. 64
  22. 98
  23. 4310
  24. Friday
  25. 15
  26. 8
  27. 792
  28. 100
  29. 4
  30. 26
  31. Sunday
  32. 396
  33. 4
  34. 9
  35. 1089
  36. 105
  37. 12
  38. 72
  39. 16
  40. 19

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