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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 919 · 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.Half of 146 =
  2. 2.What comes next? 2, 5, 8, 11, ? (a) 17 (b) 11 (c) 15 (d) 14
  3. 3.12345679 × 9 =
  4. 4.If today is Monday, what day was it 19 days ago? (a) Saturday (b) Wednesday (c) Tuesday (d) Thursday
  5. 5.Half of 68 =
  6. 6.Magic square (every row, column and diagonal has the same total): 14 16 6 | 4 12 20 | 18 8 ?. What is the missing number?
  7. 7.Half of 168 =
  8. 8.Half of 24 =
  9. 9.?78 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.9 × 5 =
  11. 11.Magic square (every row, column and diagonal has the same total): ? 9 12 | 3 15 27 | 18 21 6. What is the missing number?
  12. 12.In 2 years a boy will be 10 years old. How old was he 2 years ago?
  13. 13.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 48 (c) 56 (d) 65
  14. 14.42 × ? = 4200
  15. 15.Do the 1089 trick with 335: reverse and subtract, then reverse that answer and add. What do you get?
  16. 16.What comes next? 4, 9, 16, 25, ? (a) 36 (b) 34 (c) 37 (d) 38
  17. 17.1 + 3 + 5 + … + 31 =
  18. 18.Double 24 =
  19. 19.9 × 2 = ?8 — what is the missing digit?
  20. 20.What comes next? 9, 16, 25, 36, ? (a) 49 (b) 47 (c) 50 (d) 51
  21. 21.1 + 2 + 3 + … + 94 =
  22. 22.The 8th of a month is a Monday. What day is the 23rd of the same month? (a) Wednesday (b) Friday (c) Monday (d) Tuesday
  23. 23.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  24. 24.A girl is 5 years old and her brother is 5 years older. How old will her brother be in 4 years?
  25. 25.9 × 1 =
  26. 26.123456 × 8 + 6 =
  27. 27.Think of 2. Multiply it by 5, then add 1. What number do you end with?
  28. 28.4 × 9 =
  29. 29.Magic trick! Think of 17. Double it, add 16, halve it, then take away 17. What number do you get?
  30. 30.9 × 4 =
  31. 31.12345 × 8 + 5 =
  32. 32.396 + 693 =
  33. 33.1 + 2 + 3 + … + 95 =
  34. 34.1 + 3 + 5 + … + 23 =
  35. 35.Magic square (every row, column and diagonal has the same total): 10 20 18 | 24 16 ? | 14 12 22. What is the missing number?
  36. 36.Take 97 and take away the sum of its digits. What do you get?
  37. 37.Take 13 and take away the sum of its digits. What do you get?
  38. 38.?706 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.What comes next? 8, 16, 24, 32, ? (a) 32 (b) 48 (c) 40 (d) 41
  40. 40.2 × 9 =

Answer key

  1. 73
  2. 14
  3. 111111111
  4. Wednesday
  5. 34
  6. 10
  7. 84
  8. 12
  9. 3
  10. 45
  11. 24
  12. 6
  13. 64
  14. 100
  15. 1089
  16. 36
  17. 256
  18. 48
  19. 1
  20. 49
  21. 4465
  22. Tuesday
  23. 198
  24. 14
  25. 9
  26. 987654
  27. 11
  28. 36
  29. 8
  30. 36
  31. 98765
  32. 1089
  33. 4560
  34. 144
  35. 8
  36. 81
  37. 9
  38. 5
  39. 40
  40. 18

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