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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 766 · 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. 1.44 × 100 =
  2. 2.847 × ? = 8470
  3. 3.792 + 297 =
  4. 4.If today is Monday, what day was it 12 days ago? (a) Tuesday (b) Wednesday (c) Saturday (d) Thursday
  5. 5.?103 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.A father is 33 years old and his son is 8. How old was the father when the son was born?
  7. 7.12345679 × 18 =
  8. 8.I thought of a number, added 2 and then doubled it. I got 36. What was my number?
  9. 9.9 × 4 = 3? — what is the missing digit?
  10. 10.A piggy bank has 6 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  11. 11.Magic square (every row, column and diagonal has the same total): 24 27 12 | 9 21 33 | 30 15 ?. What is the missing number?
  12. 12.4 × 100 =
  13. 13.9 × 6 = ?4 — what is the missing digit?
  14. 14.27 × 4 =
  15. 15.Take 14 and take away the sum of its digits. What do you get?
  16. 16.9 × 2 = ?8 — what is the missing digit?
  17. 17.123456789 × 8 + 9 =
  18. 18.What comes next? 18, 22, 26, 30, ? (a) 30 (b) 34 (c) 35 (d) 38
  19. 19.Magic trick! Think of 3. Double it, add 6, halve it, then take away 3. What number do you get?
  20. 20.1234 × 9 + 5 =
  21. 21.56 × 4 =
  22. 22.Take 903. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  23. 23.86 × ? = 8600
  24. 24.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 12 (c) 17 (d) 14
  25. 25.Double 53 =
  26. 26.Magic square (every row, column and diagonal has the same total): 25 15 ? | 11 19 27 | 21 23 13. What is the missing number?
  27. 27.9 × 7 = ?3 — what is the missing digit?
  28. 28.A father is 31 years old and his son is 10. How old was the father when the son was born?
  29. 29.In 5 years a boy will be 17 years old. How old was he 2 years ago?
  30. 30.Double 29 =
  31. 31.Magic square (every row, column and diagonal has the same total): 13 6 11 | 8 ? 12 | 9 14 7. What is the missing number?
  32. 32.9 × 6 = 5? — what is the missing digit?
  33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  34. 34.7 × 1000 =
  35. 35.Double 45 =
  36. 36.1 × 9 =
  37. 37.9 × 10 = ?0 — what is the missing digit?
  38. 38.1 + 2 + 3 + … + 42 =
  39. 39.I thought of a number, added 7 and then doubled it. I got 22. What was my number?
  40. 40.What comes next? 17, 19, 21, 23, ? (a) 23 (b) 27 (c) 26 (d) 25

Answer key

  1. 4400
  2. 10
  3. 1089
  4. Wednesday
  5. 5
  6. 25
  7. 222222222
  8. 16
  9. 6
  10. 36
  11. 18
  12. 400
  13. 5
  14. 108
  15. 9
  16. 1
  17. 987654321
  18. 34
  19. 3
  20. 11111
  21. 224
  22. 594
  23. 100
  24. 16
  25. 106
  26. 17
  27. 6
  28. 21
  29. 10
  30. 58
  31. 10
  32. 4
  33. 693
  34. 7000
  35. 90
  36. 9
  37. 9
  38. 903
  39. 4
  40. 25

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