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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 503 · 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. 1.12 × 9 + 3 =
  2. 2.Double 26 =
  3. 3.What comes next? 4, 11, 18, 25, ? (a) 25 (b) 32 (c) 39 (d) 33
  4. 4.10 × 1000 =
  5. 5.I thought of a number, added 3 and then doubled it. I got 16. What was my number?
  6. 6.Double 67 =
  7. 7.158 × 10 =
  8. 8.Magic square (every row, column and diagonal has the same total): 21 11 13 | 7 15 23 | 17 ? 9. What is the missing number?
  9. 9.693 + 396 =
  10. 10.What comes next? 16, 25, 34, 43, ? (a) 43 (b) 61 (c) 52 (d) 53
  11. 11.7 × 9 =
  12. 12.What comes next? 1, 4, 7, 10, ? (a) 10 (b) 14 (c) 13 (d) 16
  13. 13.200? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.297 + 792 =
  15. 15.Double 13 =
  16. 16.Take 916. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  17. 17.1 + 2 + 3 + … + 18 =
  18. 18.Do the 1089 trick with 890: reverse and subtract, then reverse that answer and add. What do you get?
  19. 19.9 × 8 = ?2 — what is the missing digit?
  20. 20.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  21. 21.A piggy bank has 11 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
  22. 22.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 16 (c) 17 (d) 14
  23. 23.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 64 (c) 65 (d) 56
  24. 24.49 × ? = 4900
  25. 25.84 × 10 =
  26. 26.Take 39 and take away the sum of its digits. What do you get?
  27. 27.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 98 (c) 101 (d) 102
  28. 28.32 × ? = 32000
  29. 29.838 × 10 =
  30. 30.1234 × 9 + 5 =
  31. 31.Half of 124 =
  32. 32.Odd one out: which number is NOT in the 3 times table? (a) 15 (b) 6 (c) 8 (d) 18
  33. 33.18 × 1000 =
  34. 34.51 × 4 =
  35. 35.9 × 9 = ?1 — what is the missing digit?
  36. 36.8?48 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.1 + 2 + 3 + … + 87 =
  38. 38.Magic square (every row, column and diagonal has the same total): 24 3 18 | 9 15 21 | 12 ? 6. What is the missing number?
  39. 39.82 × 100 =
  40. 40.1 + 3 + 5 + … + 49 =

Answer key

  1. 111
  2. 52
  3. 32
  4. 10000
  5. 5
  6. 134
  7. 1580
  8. 19
  9. 1089
  10. 52
  11. 63
  12. 13
  13. 7
  14. 1089
  15. 26
  16. 297
  17. 171
  18. 1089
  19. 7
  20. 495
  21. 85
  22. 16
  23. 64
  24. 100
  25. 840
  26. 27
  27. 100
  28. 1000
  29. 8380
  30. 11111
  31. 62
  32. 8
  33. 18000
  34. 204
  35. 8
  36. 7
  37. 3828
  38. 27
  39. 8200
  40. 625

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