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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 753 · 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. 1.1 + 3 + 5 + … + 33 =
  2. 2.What comes next? 9, 16, 25, 36, ? (a) 49 (b) 51 (c) 50 (d) 47
  3. 3.Take 83 and take away the sum of its digits. What do you get?
  4. 4.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 14 (c) 17 (d) 16
  5. 5.7 × 9 =
  6. 6.Take 28 and take away the sum of its digits. What do you get?
  7. 7.1 + 3 + 5 + … + 31 =
  8. 8.Magic trick! Think of 3. Double it, add 16, halve it, then take away 3. What number do you get?
  9. 9.9 × 10 = 9? — what is the missing digit?
  10. 10.I thought of a number, multiplied it by 3 and added 8. I got 17. What was my number?
  11. 11.Odd one out: which number is NOT in the 3 times table? (a) 11 (b) 15 (c) 12 (d) 9
  12. 12.1 + 2 + 3 + … + 97 =
  13. 13.What comes next? 13, 21, 29, 37, ? (a) 46 (b) 37 (c) 45 (d) 53
  14. 14.9 × 4 = ?6 — what is the missing digit?
  15. 15.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 60 (c) 81 (d) 70
  16. 16.Think of 13. Multiply it by 2, then add 1. What number do you end with?
  17. 17.?172 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.693 + 396 =
  19. 19.What comes next? 8, 17, 26, 35, ? (a) 45 (b) 44 (c) 35 (d) 53
  20. 20.The 8th of a month is a Wednesday. What day is the 24th of the same month? (a) Saturday (b) Thursday (c) Monday (d) Friday
  21. 21.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹7. How many ₹2 coins do you have?
  22. 22.29 × ? = 2900
  23. 23.9 × 9 =
  24. 24.1 + 2 + 3 + … + 58 =
  25. 25.12345679 × 63 =
  26. 26.18 × 4 =
  27. 27.22 × 4 =
  28. 28.Magic square (every row, column and diagonal has the same total): 9 4 5 | 2 6 10 | 7 8 ?. What is the missing number?
  29. 29.202? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.59 × 4 =
  31. 31.I thought of a number, added 3 and then doubled it. I got 24. What was my number?
  32. 32.35 × 4 =
  33. 33.A piggy bank has 7 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  34. 34.9 × 5 = ?5 — what is the missing digit?
  35. 35.1 + 3 + 5 + … + 11 =
  36. 36.What comes next? 6, 9, 12, 15, ? (a) 18 (b) 19 (c) 15 (d) 21
  37. 37.2 × 9 =
  38. 38.Do the 1089 trick with 742: reverse and subtract, then reverse that answer and add. What do you get?
  39. 39.9 × 5 = 4? — what is the missing digit?
  40. 40.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 64 (c) 56 (d) 65

Answer key

  1. 289
  2. 49
  3. 72
  4. 16
  5. 63
  6. 18
  7. 256
  8. 8
  9. 0
  10. 3
  11. 11
  12. 4753
  13. 45
  14. 3
  15. 80
  16. 27
  17. 8
  18. 1089
  19. 44
  20. Friday
  21. 2
  22. 100
  23. 81
  24. 1711
  25. 777777777
  26. 72
  27. 88
  28. 3
  29. 5
  30. 236
  31. 9
  32. 140
  33. 63
  34. 4
  35. 36
  36. 18
  37. 18
  38. 1089
  39. 5
  40. 64

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