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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 902 · 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.Take 542. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  2. 2.Half of 18 =
  3. 3.40 × 100 =
  4. 4.What comes next? 6, 11, 16, 21, ? (a) 31 (b) 27 (c) 21 (d) 26
  5. 5.8 × 9 =
  6. 6.Do the 1089 trick with 630: reverse and subtract, then reverse that answer and add. What do you get?
  7. 7.3?65 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.9 × 8 = ?2 — what is the missing digit?
  9. 9.Odd one out: which number is NOT in the 3 times table? (a) 15 (b) 24 (c) 6 (d) 7
  10. 10.1234 × 9 + 5 =
  11. 11.If today is Friday, what day was it 8 days ago? (a) Wednesday (b) Thursday (c) Friday (d) Sunday
  12. 12.1?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Odd one out: which number is NOT in the 5 times table? (a) 10 (b) 25 (c) 35 (d) 36
  14. 14.60 × 4 =
  15. 15.59 × 4 =
  16. 16.Magic square (every row, column and diagonal has the same total): 13 14 ? | 8 12 16 | 15 10 11. What is the missing number?
  17. 17.9 × 4 = ?6 — what is the missing digit?
  18. 18.A father is 41 years old and his son is 8. How old was the father when the son was born?
  19. 19.Half of 116 =
  20. 20.Think of 4. Multiply it by 3, then add 2. What number do you end with?
  21. 21.I thought of a number, multiplied it by 3 and added 2. I got 17. What was my number?
  22. 22.Think of 3. Multiply it by 5, then add 9. What number do you end with?
  23. 23.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  24. 24.Magic square (every row, column and diagonal has the same total): 16 14 24 | 26 18 10 | 12 22 ?. What is the missing number?
  25. 25.Do the 1089 trick with 620: reverse and subtract, then reverse that answer and add. What do you get?
  26. 26.Magic square (every row, column and diagonal has the same total): 14 35 20 | 29 23 17 | 26 ? 32. What is the missing number?
  27. 27.What comes next? 17, 19, 21, 23, ? (a) 26 (b) 25 (c) 23 (d) 27
  28. 28.9 × 8 =
  29. 29.Magic square (every row, column and diagonal has the same total): 10 11 6 | ? 9 13 | 12 7 8. What is the missing number?
  30. 30.A girl is 7 years old and her brother is 6 years older. How old will her brother be in 2 years?
  31. 31.3?85 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  32. 32.11 × 11 =
  33. 33.5 × 9 =
  34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  35. 35.4 × 9 =
  36. 36.Think of 11. Multiply it by 4, then add 2. What number do you end with?
  37. 37.Magic trick! Think of 6. Double it, add 12, halve it, then take away 6. What number do you get?
  38. 38.The ages of two twins add up to 8. How old is each twin?
  39. 39.1 + 2 + 3 + … + 97 =
  40. 40.13 × 4 =

Answer key

  1. 297
  2. 9
  3. 4000
  4. 26
  5. 72
  6. 1089
  7. 4
  8. 7
  9. 7
  10. 11111
  11. Thursday
  12. 7
  13. 36
  14. 240
  15. 236
  16. 9
  17. 3
  18. 33
  19. 58
  20. 14
  21. 5
  22. 24
  23. 693
  24. 20
  25. 1089
  26. 11
  27. 25
  28. 72
  29. 5
  30. 15
  31. 2
  32. 121
  33. 45
  34. 297
  35. 36
  36. 46
  37. 6
  38. 4
  39. 4753
  40. 52

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