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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 147 · 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. 1.396 + 693 =
  2. 2.9 × 4 = ?6 — what is the missing digit?
  3. 3.Think of 3. Multiply it by 4, then add 8. What number do you end with?
  4. 4.577? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.A piggy bank has 7 coins of ₹5 and 4 coins of ₹2. How many rupees are in it?
  6. 6.9 × 8 = ?2 — what is the missing digit?
  7. 7.What comes next? 17, 25, 33, 41, ? (a) 50 (b) 41 (c) 49 (d) 57
  8. 8.Magic square (every row, column and diagonal has the same total): 8 9 ? | 3 7 11 | 10 5 6. What is the missing number?
  9. 9.9 × 6 = ?4 — what is the missing digit?
  10. 10.1 + 2 + 3 + … + 53 =
  11. 11.Take 35 and take away the sum of its digits. What do you get?
  12. 12.Take 29 and take away the sum of its digits. What do you get?
  13. 13.I thought of a number, multiplied it by 5 and added 9. I got 84. What was my number?
  14. 14.Magic square (every row, column and diagonal has the same total): 21 36 15 | 18 24 ? | 33 12 27. What is the missing number?
  15. 15.24 × 4 =
  16. 16.If today is Thursday, what day was it 18 days ago? (a) Saturday (b) Sunday (c) Wednesday (d) Monday
  17. 17.Magic square (every row, column and diagonal has the same total): 14 11 26 | 29 17 5 | ? 23 20. What is the missing number?
  18. 18.Odd one out: which number is NOT in the 6 times table? (a) 36 (b) 18 (c) 24 (d) 59
  19. 19.1 + 2 + 3 + … + 15 =
  20. 20.A girl is 11 years old and her brother is 5 years older. How old will her brother be in 5 years?
  21. 21.73?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 23 (c) 25 (d) 26
  23. 23.7 × 9 =
  24. 24.12 × 4 =
  25. 25.Magic trick! Think of 18. Double it, add 18, halve it, then take away 18. What number do you get?
  26. 26.8 × 9 =
  27. 27.393 × 10 =
  28. 28.9 × 9 =
  29. 29.820 × 10 =
  30. 30.Double 89 =
  31. 31.Take 23 and take away the sum of its digits. What do you get?
  32. 32.What comes next? 14, 18, 22, 26, ? (a) 34 (b) 30 (c) 26 (d) 31
  33. 33.Take 920. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  34. 34.Double 99 =
  35. 35.In 4 years a boy will be 17 years old. How old was he 6 years ago?
  36. 36.782 × ? = 7820
  37. 37.Think of 5. Multiply it by 5, then add 2. What number do you end with?
  38. 38.1 + 3 + 5 + … + 47 =
  39. 39.9 × 3 = ?7 — what is the missing digit?
  40. 40.123456789 × 8 + 9 =

Answer key

  1. 1089
  2. 3
  3. 20
  4. 8
  5. 43
  6. 7
  7. 49
  8. 4
  9. 5
  10. 1431
  11. 27
  12. 18
  13. 15
  14. 30
  15. 96
  16. Sunday
  17. 8
  18. 59
  19. 120
  20. 21
  21. 1
  22. 25
  23. 63
  24. 48
  25. 9
  26. 72
  27. 3930
  28. 81
  29. 8200
  30. 178
  31. 18
  32. 30
  33. 891
  34. 198
  35. 7
  36. 10
  37. 27
  38. 576
  39. 2
  40. 987654321

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