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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 652 · 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? 18, 23, 28, 33, ? (a) 43 (b) 38 (c) 39 (d) 33
  2. 2.Double 95 =
  3. 3.792 + 297 =
  4. 4.12 × 4 =
  5. 5.44 × 4 =
  6. 6.176 × ? = 1760
  7. 7.574 × 10 =
  8. 8.The ages of two twins add up to 28. How old is each twin?
  9. 9.9 × 2 = ?8 — what is the missing digit?
  10. 10.Magic trick! Think of 4. Double it, add 16, halve it, then take away 4. What number do you get?
  11. 11.535 × ? = 5350
  12. 12.1?42 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.I thought of a number, multiplied it by 4 and added 8. I got 40. What was my number?
  14. 14.19 × 4 =
  15. 15.3 × ? = 3000
  16. 16.Think of 11. Multiply it by 2, then add 5. What number do you end with?
  17. 17.A piggy bank has 10 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
  18. 18.38 × 4 =
  19. 19.Double 94 =
  20. 20.9 × 10 = 9? — what is the missing digit?
  21. 21.9 × 5 = 4? — what is the missing digit?
  22. 22.123456 × 9 + 7 =
  23. 23.26 × 4 =
  24. 24.In 6 years a boy will be 17 years old. How old was he 4 years ago?
  25. 25.Do the 1089 trick with 597: reverse and subtract, then reverse that answer and add. What do you get?
  26. 26.Double 98 =
  27. 27.9 × 9 = ?1 — what is the missing digit?
  28. 28.9 × 7 = 6? — what is the missing digit?
  29. 29.Odd one out: which number is NOT in the 7 times table? (a) 56 (b) 40 (c) 28 (d) 42
  30. 30.6 × 9 =
  31. 31.1 + 2 + 3 + … + 57 =
  32. 32.If today is Friday, what day will it be after 39 days? (a) Friday (b) Wednesday (c) Monday (d) Tuesday
  33. 33.Half of 46 =
  34. 34.9 × 7 = ?3 — what is the missing digit?
  35. 35.If today is Saturday, what day was it 23 days ago? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
  36. 36.9 × 5 = ?5 — what is the missing digit?
  37. 37.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  38. 38.Magic square (every row, column and diagonal has the same total): 4 9 8 | 11 7 3 | ? 5 10. What is the missing number?
  39. 39.1 + 3 + 5 + … + 17 =
  40. 40.1 + 3 + 5 + … + 45 =

Answer key

  1. 38
  2. 190
  3. 1089
  4. 48
  5. 176
  6. 10
  7. 5740
  8. 14
  9. 1
  10. 8
  11. 10
  12. 2
  13. 8
  14. 76
  15. 1000
  16. 27
  17. 72
  18. 152
  19. 188
  20. 0
  21. 5
  22. 1111111
  23. 104
  24. 7
  25. 1089
  26. 196
  27. 8
  28. 3
  29. 40
  30. 54
  31. 1653
  32. Tuesday
  33. 23
  34. 6
  35. Thursday
  36. 4
  37. 396
  38. 6
  39. 81
  40. 529

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