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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 645 · 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.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 80 (c) 70 (d) 81
  2. 2.The 5th of a month is a Monday. What day is the 13th of the same month? (a) Monday (b) Tuesday (c) Friday (d) Wednesday
  3. 3.49 × 4 =
  4. 4.What comes next? 15, 19, 23, 27, ? (a) 31 (b) 32 (c) 35 (d) 27
  5. 5.12 × 9 + 3 =
  6. 6.9 × 6 = 5? — what is the missing digit?
  7. 7.602 × ? = 6020
  8. 8.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  9. 9.What comes next? 13, 19, 25, 31, ? (a) 43 (b) 38 (c) 37 (d) 31
  10. 10.The ages of two twins add up to 20. How old is each twin?
  11. 11.Double 17 =
  12. 12.What comes next? 11, 13, 15, 17, ? (a) 17 (b) 19 (c) 20 (d) 21
  13. 13.Half of 62 =
  14. 14.?458 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  15. 15.Magic trick! Think of 6. Double it, add 10, halve it, then take away 6. What number do you get?
  16. 16.Double 44 =
  17. 17.11 × 11 =
  18. 18.56 × 4 =
  19. 19.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 5 years?
  20. 20.If today is Saturday, what day will it be after 31 days? (a) Monday (b) Tuesday (c) Wednesday (d) Friday
  21. 21.1 + 2 + 3 + … + 17 =
  22. 22.?548 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.Think of 2. Multiply it by 4, then add 5. What number do you end with?
  24. 24.18 × 4 =
  25. 25.49?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.Magic square (every row, column and diagonal has the same total): 15 10 17 | ? 14 12 | 11 18 13. What is the missing number?
  27. 27.Double 23 =
  28. 28.The 8th of a month is a Thursday. What day is the 26th of the same month? (a) Tuesday (b) Sunday (c) Thursday (d) Monday
  29. 29.?94 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.281 × ? = 2810
  31. 31.Do the 1089 trick with 360: reverse and subtract, then reverse that answer and add. What do you get?
  32. 32.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 3 years?
  33. 33.If today is Thursday, what day was it 10 days ago? (a) Sunday (b) Thursday (c) Tuesday (d) Monday
  34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  35. 35.9 × 3 = ?7 — what is the missing digit?
  36. 36.Magic square (every row, column and diagonal has the same total): 19 9 11 | ? 13 21 | 15 17 7. What is the missing number?
  37. 37.If today is Friday, what day will it be after 58 days? (a) Saturday (b) Wednesday (c) Monday (d) Sunday
  38. 38.If today is Sunday, what day will it be after 65 days? (a) Friday (b) Monday (c) Tuesday (d) Wednesday
  39. 39.9 × 7 = ?3 — what is the missing digit?
  40. 40.34 × ? = 34000

Answer key

  1. 80
  2. Tuesday
  3. 196
  4. 31
  5. 111
  6. 4
  7. 10
  8. 891
  9. 37
  10. 10
  11. 34
  12. 19
  13. 31
  14. 1
  15. 5
  16. 88
  17. 121
  18. 224
  19. 16
  20. Tuesday
  21. 153
  22. 1
  23. 13
  24. 72
  25. 5
  26. 16
  27. 46
  28. Monday
  29. 5
  30. 10
  31. 1089
  32. 14
  33. Monday
  34. 495
  35. 2
  36. 5
  37. Sunday
  38. Tuesday
  39. 6
  40. 1000

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