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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 206 · 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. 1.9 × 4 = 3? — what is the missing digit?
  2. 2.Magic trick! Think of 4. Double it, add 10, halve it, then take away 4. What number do you get?
  3. 3.1 + 3 + 5 + … + 21 =
  4. 4.Half of 174 =
  5. 5.What comes next? 1, 7, 13, 19, ? (a) 25 (b) 19 (c) 31 (d) 26
  6. 6.9 × 3 =
  7. 7.1 + 2 + 3 + … + 86 =
  8. 8.11111 × 11111 =
  9. 9.29 × 4 =
  10. 10.Take 58 and take away the sum of its digits. What do you get?
  11. 11.3?53 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.Magic square (every row, column and diagonal has the same total): 26 11 ? | 5 17 29 | 20 23 8. What is the missing number?
  13. 13.11 × 11 =
  14. 14.9 × 4 = ?6 — what is the missing digit?
  15. 15.A piggy bank has 10 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  16. 16.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  17. 17.14 × 4 =
  18. 18.123 × 8 + 3 =
  19. 19.Do the 1089 trick with 753: reverse and subtract, then reverse that answer and add. What do you get?
  20. 20.551? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.A piggy bank has 6 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  22. 22.Half of 22 =
  23. 23.8?40 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.15 × 4 =
  25. 25.9 × 5 =
  26. 26.3 × 9 =
  27. 27.A father is 33 years old and his son is 12. How old was the father when the son was born?
  28. 28.Magic square (every row, column and diagonal has the same total): 13 27 17 | 23 19 15 | 21 ? 25. What is the missing number?
  29. 29.Think of 3. Multiply it by 2, then add 9. What number do you end with?
  30. 30.The ages of two twins add up to 20. How old is each twin?
  31. 31.37 × 4 =
  32. 32.123456 × 8 + 6 =
  33. 33.Do the 1089 trick with 641: reverse and subtract, then reverse that answer and add. What do you get?
  34. 34.9 × 4 =
  35. 35.172 × 10 =
  36. 36.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 65 (c) 64 (d) 56
  37. 37.51 × 4 =
  38. 38.813 × 10 =
  39. 39.6 × 9 =
  40. 40.40 × 1000 =

Answer key

  1. 6
  2. 5
  3. 121
  4. 87
  5. 25
  6. 27
  7. 3741
  8. 123454321
  9. 116
  10. 45
  11. 7
  12. 14
  13. 121
  14. 3
  15. 56
  16. 198
  17. 56
  18. 987
  19. 1089
  20. 7
  21. 40
  22. 11
  23. 6
  24. 60
  25. 45
  26. 27
  27. 21
  28. 11
  29. 15
  30. 10
  31. 148
  32. 987654
  33. 1089
  34. 36
  35. 1720
  36. 64
  37. 204
  38. 8130
  39. 54
  40. 40000

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