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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 239 · 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.Magic trick! Think of 13. Double it, add 10, halve it, then take away 13. What number do you get?
  2. 2.Double 92 =
  3. 3.Magic square (every row, column and diagonal has the same total): 7 22 19 | 28 ? 4 | 13 10 25. What is the missing number?
  4. 4.39 × 4 =
  5. 5.13 × 4 =
  6. 6.Think of 10. Multiply it by 4, then add 1. What number do you end with?
  7. 7.13 × 1000 =
  8. 8.1 + 3 + 5 + … + 41 =
  9. 9.9 × 10 =
  10. 10.799? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.1 + 2 + 3 + … + 26 =
  12. 12.9 × 6 =
  13. 13.A father is 35 years old and his son is 10. How old was the father when the son was born?
  14. 14.22 × 4 =
  15. 15.Odd one out: which number is NOT in the 5 times table? (a) 20 (b) 34 (c) 25 (d) 10
  16. 16.2 × 9 =
  17. 17.Think of 4. Multiply it by 2, then add 1. What number do you end with?
  18. 18.48?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 12 (c) 14 (d) 17
  20. 20.11111 × 11111 =
  21. 21.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 51 (c) 49 (d) 50
  22. 22.9 × 3 =
  23. 23.?419 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.1 + 3 + 5 + … + 45 =
  25. 25.Double 32 =
  26. 26.A piggy bank has 9 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
  27. 27.Double 27 =
  28. 28.9 × 4 = ?6 — what is the missing digit?
  29. 29.In 3 years a boy will be 14 years old. How old was he 6 years ago?
  30. 30.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹12. How many ₹2 coins do you have?
  31. 31.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  32. 32.8 × 9 =
  33. 33.Odd one out: which number is NOT in the 8 times table? (a) 40 (b) 62 (c) 56 (d) 16
  34. 34.1 + 2 + 3 + … + 7 =
  35. 35.10?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.9 × 6 = 5? — what is the missing digit?
  37. 37.12345679 × 18 =
  38. 38.17 × 1000 =
  39. 39.12345679 × 63 =
  40. 40.I thought of a number, added 6 and then doubled it. I got 24. What was my number?

Answer key

  1. 5
  2. 184
  3. 16
  4. 156
  5. 52
  6. 41
  7. 13000
  8. 441
  9. 90
  10. 2
  11. 351
  12. 54
  13. 25
  14. 88
  15. 34
  16. 18
  17. 9
  18. 9
  19. 16
  20. 123454321
  21. 49
  22. 27
  23. 4
  24. 529
  25. 64
  26. 67
  27. 54
  28. 3
  29. 5
  30. 5
  31. 495
  32. 72
  33. 62
  34. 28
  35. 4
  36. 4
  37. 222222222
  38. 17000
  39. 777777777
  40. 6

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