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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 480 · 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.If today is Wednesday, what day was it 45 days ago? (a) Saturday (b) Monday (c) Sunday (d) Wednesday
  2. 2.12345679 × 27 =
  3. 3.53 × 4 =
  4. 4.I thought of a number, added 7 and then doubled it. I got 32. What was my number?
  5. 5.9 × 4 = ?6 — what is the missing digit?
  6. 6.1 + 2 + 3 + … + 39 =
  7. 7.Magic square (every row, column and diagonal has the same total): 16 31 ? | 13 19 25 | 28 7 22. What is the missing number?
  8. 8.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  9. 9.The 7th of a month is a Monday. What day is the 19th of the same month? (a) Friday (b) Sunday (c) Saturday (d) Tuesday
  10. 10.27 × 4 =
  11. 11.What comes next? 5, 10, 15, 20, ? (a) 20 (b) 25 (c) 30 (d) 26
  12. 12.Magic square (every row, column and diagonal has the same total): 15 ? 27 | 30 18 6 | 9 24 21. What is the missing number?
  13. 13.What comes next? 7, 11, 15, 19, ? (a) 19 (b) 27 (c) 23 (d) 24
  14. 14.If today is Sunday, what day will it be after 14 days? (a) Monday (b) Sunday (c) Wednesday (d) Saturday
  15. 15.18 × 10 =
  16. 16.1 + 3 + 5 + … + 25 =
  17. 17.12345679 × 36 =
  18. 18.1?10 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.1 + 2 + 3 + … + 98 =
  20. 20.Odd one out: which number is NOT in the 5 times table? (a) 35 (b) 15 (c) 20 (d) 34
  21. 21.9 × 2 =
  22. 22.9 × 8 = ?2 — what is the missing digit?
  23. 23.9 × 1 =
  24. 24.A father is 38 years old and his son is 9. How old was the father when the son was born?
  25. 25.20 × 4 =
  26. 26.89 × 100 =
  27. 27.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 14 (c) 16 (d) 12
  28. 28.37 × 1000 =
  29. 29.1 + 3 + 5 + … + 31 =
  30. 30.1 + 2 + 3 + … + 81 =
  31. 31.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 49 (c) 42 (d) 48
  32. 32.Double 47 =
  33. 33.9 × 5 =
  34. 34.793? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.7?75 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.Magic square (every row, column and diagonal has the same total): ? 14 24 | 26 18 10 | 12 22 20. What is the missing number?
  37. 37.Take 27 and take away the sum of its digits. What do you get?
  38. 38.Take 370. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.720? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.123 × 8 + 3 =

Answer key

  1. Sunday
  2. 333333333
  3. 212
  4. 9
  5. 3
  6. 780
  7. 10
  8. 495
  9. Saturday
  10. 108
  11. 25
  12. 12
  13. 23
  14. Sunday
  15. 180
  16. 169
  17. 444444444
  18. 7
  19. 4851
  20. 34
  21. 18
  22. 7
  23. 9
  24. 29
  25. 80
  26. 8900
  27. 16
  28. 37000
  29. 256
  30. 3321
  31. 48
  32. 94
  33. 45
  34. 8
  35. 8
  36. 16
  37. 18
  38. 297
  39. 9
  40. 987

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