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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 526 · 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.The 1st of a month is a Friday. What day is the 9th of the same month? (a) Friday (b) Sunday (c) Tuesday (d) Saturday
  2. 2.48 × 4 =
  3. 3.If today is Thursday, what day will it be after 77 days? (a) Sunday (b) Friday (c) Wednesday (d) Thursday
  4. 4.Take 286. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  5. 5.44 × 4 =
  6. 6.Magic square (every row, column and diagonal has the same total): 16 11 12 | ? 13 17 | 14 15 10. What is the missing number?
  7. 7.1 + 2 + 3 + … + 47 =
  8. 8.Magic square (every row, column and diagonal has the same total): 27 30 15 | 12 24 36 | 33 18 ?. What is the missing number?
  9. 9.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 23 (c) 26 (d) 27
  10. 10.9 × 4 = ?6 — what is the missing digit?
  11. 11.9 × 4 = 3? — what is the missing digit?
  12. 12.37 × 27 =
  13. 13.In 5 years a boy will be 18 years old. How old was he 6 years ago?
  14. 14.792 + 297 =
  15. 15.4?66 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  16. 16.If today is Saturday, what day will it be after 22 days? (a) Wednesday (b) Sunday (c) Monday (d) Saturday
  17. 17.6 × 9 =
  18. 18.22 × 4 =
  19. 19.23 × 1000 =
  20. 20.I thought of a number, added 1 and then doubled it. I got 12. What was my number?
  21. 21.Magic square (every row, column and diagonal has the same total): 21 7 17 | 11 ? 19 | 13 23 9. What is the missing number?
  22. 22.Take 456. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  23. 23.13 × 4 =
  24. 24.If today is Thursday, what day will it be after 17 days? (a) Monday (b) Wednesday (c) Sunday (d) Saturday
  25. 25.A father is 35 years old and his son is 4. How old was the father when the son was born?
  26. 26.Think of 12. Multiply it by 2, then add 8. What number do you end with?
  27. 27.Take 482. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  28. 28.10 × ? = 10000
  29. 29.Take 19 and take away the sum of its digits. What do you get?
  30. 30.3 × 9 =
  31. 31.58 × 4 =
  32. 32.Half of 154 =
  33. 33.39 × 4 =
  34. 34.9 × 8 = 7? — what is the missing digit?
  35. 35.Double 59 =
  36. 36.37 × 21 =
  37. 37.Magic square (every row, column and diagonal has the same total): 14 15 ? | 9 13 17 | 16 11 12. What is the missing number?
  38. 38.61?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.7 × ? = 700
  40. 40.I thought of a number, added 5 and then doubled it. I got 40. What was my number?

Answer key

  1. Saturday
  2. 192
  3. Thursday
  4. 396
  5. 176
  6. 9
  7. 1128
  8. 21
  9. 25
  10. 3
  11. 6
  12. 999
  13. 7
  14. 1089
  15. 2
  16. Sunday
  17. 54
  18. 88
  19. 23000
  20. 5
  21. 15
  22. 198
  23. 52
  24. Sunday
  25. 31
  26. 32
  27. 198
  28. 1000
  29. 9
  30. 27
  31. 232
  32. 77
  33. 156
  34. 2
  35. 118
  36. 777
  37. 10
  38. 2
  39. 100
  40. 15

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