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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 461 · 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 + 2 + 3 + … + 69 =
  2. 2.In 3 years a boy will be 12 years old. How old was he 2 years ago?
  3. 3.72?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.1 + 3 + 5 + … + 27 =
  5. 5.Magic square (every row, column and diagonal has the same total): 15 8 13 | ? 12 14 | 11 16 9. What is the missing number?
  6. 6.12 × 8 + 2 =
  7. 7.The 4th of a month is a Wednesday. What day is the 27th of the same month? (a) Thursday (b) Friday (c) Saturday (d) Monday
  8. 8.A piggy bank has 9 coins of ₹5 and 2 coins of ₹2. How many rupees are in it?
  9. 9.Half of 128 =
  10. 10.Take 95 and take away the sum of its digits. What do you get?
  11. 11.Magic trick! Think of 17. Double it, add 18, halve it, then take away 17. What number do you get?
  12. 12.?220 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.Double 95 =
  14. 14.17 × 1000 =
  15. 15.A girl is 6 years old and her brother is 4 years older. How old will her brother be in 6 years?
  16. 16.9 × 9 = ?1 — what is the missing digit?
  17. 17.56 × 4 =
  18. 18.165 × 10 =
  19. 19.9 × 6 =
  20. 20.1234 × 8 + 4 =
  21. 21.1111 × 1111 =
  22. 22.?559 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.7 × 4 =
  24. 24.4 × 9 =
  25. 25.1234567 × 8 + 7 =
  26. 26.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 49 (c) 50 (d) 51
  27. 27.14 × 4 =
  28. 28.9 × 3 = 2? — what is the missing digit?
  29. 29.Double 97 =
  30. 30.Double 98 =
  31. 31.I thought of a number, added 9 and then doubled it. I got 40. What was my number?
  32. 32.A father is 31 years old and his son is 9. How old was the father when the son was born?
  33. 33.The 4th of a month is a Saturday. What day is the 25th of the same month? (a) Sunday (b) Friday (c) Tuesday (d) Saturday
  34. 34.1 + 3 + 5 + … + 9 =
  35. 35.Magic trick! Think of 2. Double it, add 8, halve it, then take away 2. What number do you get?
  36. 36.9 × 4 =
  37. 37.Do the 1089 trick with 376: reverse and subtract, then reverse that answer and add. What do you get?
  38. 38.Magic square (every row, column and diagonal has the same total): 6 21 ? | 27 15 3 | 12 9 24. What is the missing number?
  39. 39.297 + 792 =
  40. 40.A piggy bank has 7 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?

Answer key

  1. 2415
  2. 7
  3. 9
  4. 196
  5. 10
  6. 98
  7. Friday
  8. 49
  9. 64
  10. 81
  11. 9
  12. 5
  13. 190
  14. 17000
  15. 16
  16. 8
  17. 224
  18. 1650
  19. 54
  20. 9876
  21. 1234321
  22. 8
  23. 28
  24. 36
  25. 9876543
  26. 49
  27. 56
  28. 7
  29. 194
  30. 196
  31. 11
  32. 22
  33. Saturday
  34. 25
  35. 4
  36. 36
  37. 1089
  38. 18
  39. 1089
  40. 45

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