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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 928 · 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.Double 46 =
  2. 2.Do the 1089 trick with 107: reverse and subtract, then reverse that answer and add. What do you get?
  3. 3.In 2 years a boy will be 10 years old. How old was he 3 years ago?
  4. 4.58 × 4 =
  5. 5.37 × 24 =
  6. 6.25 × 100 =
  7. 7.Magic square (every row, column and diagonal has the same total): 14 15 ? | 9 13 17 | 16 11 12. What is the missing number?
  8. 8.If today is Monday, what day was it 15 days ago? (a) Wednesday (b) Saturday (c) Sunday (d) Monday
  9. 9.A father is 42 years old and his son is 7. How old was the father when the son was born?
  10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  11. 11.9 × 1 =
  12. 12.1 + 2 + 3 + … + 22 =
  13. 13.Magic square (every row, column and diagonal has the same total): 11 10 15 | 16 12 8 | 9 14 ?. What is the missing number?
  14. 14.88 × ? = 8800
  15. 15.Double 31 =
  16. 16.?723 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.59 × 4 =
  18. 18.Magic square (every row, column and diagonal has the same total): 25 28 13 | 10 22 34 | 31 16 ?. What is the missing number?
  19. 19.26 × 4 =
  20. 20.9 × 8 = 7? — what is the missing digit?
  21. 21.14 × 1000 =
  22. 22.I thought of a number, added 3 and then doubled it. I got 38. What was my number?
  23. 23.Magic trick! Think of 8. Double it, add 14, halve it, then take away 8. What number do you get?
  24. 24.What comes next? 16, 20, 24, 28, ? (a) 36 (b) 28 (c) 33 (d) 32
  25. 25.12 × 9 + 3 =
  26. 26.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 66 (c) 64 (d) 62
  27. 27.If today is Saturday, what day was it 56 days ago? (a) Saturday (b) Sunday (c) Friday (d) Tuesday
  28. 28.What comes next? 7, 16, 25, 34, ? (a) 43 (b) 44 (c) 34 (d) 52
  29. 29.Take 77 and take away the sum of its digits. What do you get?
  30. 30.A father is 40 years old and his son is 6. How old was the father when the son was born?
  31. 31.Take 94 and take away the sum of its digits. What do you get?
  32. 32.Take 610. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  33. 33.594 + 495 =
  34. 34.8 × 9 =
  35. 35.12345 × 8 + 5 =
  36. 36.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 80 (c) 70 (d) 81
  37. 37.What comes next? 8, 16, 24, 32, ? (a) 40 (b) 32 (c) 48 (d) 41
  38. 38.Take 369. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.Double 19 =
  40. 40.Odd one out: which number is NOT in the 9 times table? (a) 27 (b) 36 (c) 18 (d) 67

Answer key

  1. 92
  2. 1089
  3. 5
  4. 232
  5. 888
  6. 2500
  7. 10
  8. Sunday
  9. 35
  10. 594
  11. 9
  12. 253
  13. 13
  14. 100
  15. 62
  16. 6
  17. 236
  18. 19
  19. 104
  20. 2
  21. 14000
  22. 16
  23. 7
  24. 32
  25. 111
  26. 64
  27. Saturday
  28. 43
  29. 63
  30. 34
  31. 81
  32. 594
  33. 1089
  34. 72
  35. 98765
  36. 80
  37. 40
  38. 594
  39. 38
  40. 67

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