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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 730 · 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.Magic square (every row, column and diagonal has the same total): 8 22 12 | ? 14 10 | 16 6 20. What is the missing number?
  2. 2.I thought of a number, added 8 and then doubled it. I got 40. What was my number?
  3. 3.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 24 (c) 32 (d) 28
  4. 4.Take 850. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  5. 5.111111 × 111111 =
  6. 6.The ages of two twins add up to 10. How old is each twin?
  7. 7.The ages of two twins add up to 24. How old is each twin?
  8. 8.1 + 3 + 5 + … + 39 =
  9. 9.5?11 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.1 + 2 + 3 + … + 91 =
  11. 11.29 × 4 =
  12. 12.Take 86 and take away the sum of its digits. What do you get?
  13. 13.8 × 9 =
  14. 14.96 × 100 =
  15. 15.Magic square (every row, column and diagonal has the same total): 11 6 7 | 4 8 12 | 9 10 ?. What is the missing number?
  16. 16.1 + 2 + 3 + … + 35 =
  17. 17.Magic square (every row, column and diagonal has the same total): 12 26 ? | 22 18 14 | 20 10 24. What is the missing number?
  18. 18.59 × 4 =
  19. 19.9 × 6 = ?4 — what is the missing digit?
  20. 20.12 × 9 + 3 =
  21. 21.The ages of two twins add up to 20. How old is each twin?
  22. 22.What comes next? 16, 25, 34, 43, ? (a) 61 (b) 53 (c) 52 (d) 43
  23. 23.The 5th of a month is a Monday. What day is the 17th of the same month? (a) Saturday (b) Tuesday (c) Sunday (d) Friday
  24. 24.22 × 4 =
  25. 25.A girl is 11 years old and her brother is 2 years older. How old will her brother be in 2 years?
  26. 26.A father is 34 years old and his son is 9. How old was the father when the son was born?
  27. 27.What comes next? 4, 7, 10, 13, ? (a) 17 (b) 19 (c) 13 (d) 16
  28. 28.Magic trick! Think of 9. Double it, add 18, halve it, then take away 9. What number do you get?
  29. 29.806 × 10 =
  30. 30.12345679 × 72 =
  31. 31.Take 990. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  32. 32.Odd one out: which number is NOT in the 7 times table? (a) 42 (b) 28 (c) 63 (d) 67
  33. 33.9 × 7 = ?3 — what is the missing digit?
  34. 34.Magic trick! Think of 11. Double it, add 16, halve it, then take away 11. What number do you get?
  35. 35.Take 44 and take away the sum of its digits. What do you get?
  36. 36.What comes next? 10, 18, 26, 34, ? (a) 50 (b) 42 (c) 34 (d) 43
  37. 37.47 × ? = 47000
  38. 38.The 5th of a month is a Saturday. What day is the 18th of the same month? (a) Thursday (b) Saturday (c) Friday (d) Monday
  39. 39.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 50 (c) 51 (d) 49
  40. 40.The 7th of a month is a Saturday. What day is the 30th of the same month? (a) Thursday (b) Sunday (c) Tuesday (d) Monday

Answer key

  1. 18
  2. 12
  3. 32
  4. 792
  5. 12345654321
  6. 5
  7. 12
  8. 400
  9. 2
  10. 4186
  11. 116
  12. 72
  13. 72
  14. 9600
  15. 5
  16. 630
  17. 16
  18. 236
  19. 5
  20. 111
  21. 10
  22. 52
  23. Saturday
  24. 88
  25. 15
  26. 25
  27. 16
  28. 9
  29. 8060
  30. 888888888
  31. 891
  32. 67
  33. 6
  34. 8
  35. 36
  36. 42
  37. 1000
  38. Friday
  39. 49
  40. Monday

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