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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 419 · 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 × 10 = 9? — what is the missing digit?
  2. 2.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
  3. 3.The 6th of a month is a Tuesday. What day is the 18th of the same month? (a) Wednesday (b) Saturday (c) Sunday (d) Monday
  4. 4.1 + 2 + 3 + … + 78 =
  5. 5.Odd one out: which number is NOT in the 7 times table? (a) 14 (b) 42 (c) 27 (d) 21
  6. 6.Double 59 =
  7. 7.168 × ? = 1680
  8. 8.468 × 10 =
  9. 9.Take 23 and take away the sum of its digits. What do you get?
  10. 10.?421 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Magic square (every row, column and diagonal has the same total): 10 8 18 | 20 12 4 | 6 16 ?. What is the missing number?
  12. 12.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 81 (c) 80 (d) 60
  13. 13.1 + 2 + 3 + … + 34 =
  14. 14.Odd one out: which number is NOT in the 8 times table? (a) 24 (b) 48 (c) 16 (d) 70
  15. 15.Magic square (every row, column and diagonal has the same total): 18 8 10 | 4 12 20 | 14 ? 6. What is the missing number?
  16. 16.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 66 (c) 62 (d) 64
  17. 17.53 × 4 =
  18. 18.If today is Saturday, what day will it be after 23 days? (a) Thursday (b) Monday (c) Tuesday (d) Sunday
  19. 19.9 × 8 = ?2 — what is the missing digit?
  20. 20.The 7th of a month is a Friday. What day is the 29th of the same month? (a) Saturday (b) Friday (c) Sunday (d) Tuesday
  21. 21.6 × 4 =
  22. 22.21 × 100 =
  23. 23.A girl is 8 years old and her brother is 4 years older. How old will her brother be in 9 years?
  24. 24.9 × 6 = 5? — what is the missing digit?
  25. 25.10 × 4 =
  26. 26.9 × 4 = ?6 — what is the missing digit?
  27. 27.A girl is 12 years old and her brother is 6 years older. How old will her brother be in 9 years?
  28. 28.The 3rd of a month is a Wednesday. What day is the 19th of the same month? (a) Saturday (b) Friday (c) Thursday (d) Monday
  29. 29.655 × 10 =
  30. 30.9 × 6 = ?4 — what is the missing digit?
  31. 31.5 × 9 =
  32. 32.1 + 3 + 5 + … + 33 =
  33. 33.53 × 100 =
  34. 34.21 × 4 =
  35. 35.22 × 4 =
  36. 36.Half of 64 =
  37. 37.11111 × 11111 =
  38. 38.If today is Thursday, what day will it be after 47 days? (a) Tuesday (b) Wednesday (c) Monday (d) Friday
  39. 39.What comes next? 1, 8, 15, 22, ? (a) 22 (b) 29 (c) 30 (d) 36
  40. 40.Odd one out: which number is NOT in the 9 times table? (a) 54 (b) 18 (c) 45 (d) 49

Answer key

  1. 0
  2. 891
  3. Sunday
  4. 3081
  5. 27
  6. 118
  7. 10
  8. 4680
  9. 18
  10. 2
  11. 14
  12. 80
  13. 595
  14. 70
  15. 16
  16. 64
  17. 212
  18. Monday
  19. 7
  20. Saturday
  21. 24
  22. 2100
  23. 21
  24. 4
  25. 40
  26. 3
  27. 27
  28. Friday
  29. 6550
  30. 5
  31. 45
  32. 289
  33. 5300
  34. 84
  35. 88
  36. 32
  37. 123454321
  38. Tuesday
  39. 29
  40. 49

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