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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 353 · 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. 1.3?28 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  2. 2.12345 × 9 + 6 =
  3. 3.19 × 4 =
  4. 4.9 × 4 = ?6 — what is the missing digit?
  5. 5.12345 × 8 + 5 =
  6. 6.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹14. How many ₹2 coins do you have?
  7. 7.9 × 1 =
  8. 8.9 × 7 = ?3 — what is the missing digit?
  9. 9.A father is 41 years old and his son is 13. How old was the father when the son was born?
  10. 10.Magic square (every row, column and diagonal has the same total): 4 11 6 | 9 7 5 | ? 3 10. What is the missing number?
  11. 11.12?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.12345679 × 63 =
  13. 13.19 × 1000 =
  14. 14.1234567 × 8 + 7 =
  15. 15.What comes next? 6, 15, 24, 33, ? (a) 43 (b) 42 (c) 51 (d) 33
  16. 16.3 × 100 =
  17. 17.In 2 years a boy will be 14 years old. How old was he 7 years ago?
  18. 18.10 × 1000 =
  19. 19.Half of 22 =
  20. 20.12345679 × 18 =
  21. 21.I thought of a number, multiplied it by 4 and added 7. I got 31. What was my number?
  22. 22.A girl is 10 years old and her brother is 2 years older. How old will her brother be in 4 years?
  23. 23.9 × 10 = ?0 — what is the missing digit?
  24. 24.Take 35 and take away the sum of its digits. What do you get?
  25. 25.Take 72 and take away the sum of its digits. What do you get?
  26. 26.1 + 2 + 3 + … + 13 =
  27. 27.I thought of a number, added 3 and then doubled it. I got 26. What was my number?
  28. 28.Magic square (every row, column and diagonal has the same total): 13 15 5 | 3 11 19 | 17 7 ?. What is the missing number?
  29. 29.Take 134. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.9 × 9 = ?1 — what is the missing digit?
  31. 31.I thought of a number, added 1 and then doubled it. I got 28. What was my number?
  32. 32.I thought of a number, multiplied it by 5 and added 7. I got 17. What was my number?
  33. 33.40 × 1000 =
  34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  35. 35.73 × 10 =
  36. 36.37 × 18 =
  37. 37.The ages of two twins add up to 8. How old is each twin?
  38. 38.44 × ? = 44000
  39. 39.9 × 10 =
  40. 40.31 × ? = 31000

Answer key

  1. 5
  2. 111111
  3. 76
  4. 3
  5. 98765
  6. 1
  7. 9
  8. 6
  9. 28
  10. 8
  11. 2
  12. 777777777
  13. 19000
  14. 9876543
  15. 42
  16. 300
  17. 5
  18. 10000
  19. 11
  20. 222222222
  21. 6
  22. 16
  23. 9
  24. 27
  25. 63
  26. 91
  27. 10
  28. 9
  29. 297
  30. 8
  31. 13
  32. 2
  33. 40000
  34. 594
  35. 730
  36. 666
  37. 4
  38. 1000
  39. 90
  40. 1000

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