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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 25 · 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. 1.5 × 9 =
  2. 2.1 + 3 + 5 + … + 9 =
  3. 3.37 × 3 =
  4. 4.9 × 4 =
  5. 5.12345679 × 36 =
  6. 6.2?79 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.17?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  8. 8.In 5 years a boy will be 15 years old. How old was he 5 years ago?
  9. 9.891 + 198 =
  10. 10.17 × ? = 17000
  11. 11.9 × 9 = 8? — what is the missing digit?
  12. 12.In 2 years a boy will be 16 years old. How old was he 2 years ago?
  13. 13.What comes next? 15, 19, 23, 27, ? (a) 27 (b) 31 (c) 32 (d) 35
  14. 14.9 × 7 = 6? — what is the missing digit?
  15. 15.9 × 3 = 2? — what is the missing digit?
  16. 16.If today is Sunday, what day was it 59 days ago? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
  17. 17.The ages of two twins add up to 16. How old is each twin?
  18. 18.6?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Double 69 =
  20. 20.79?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.A father is 30 years old and his son is 4. How old was the father when the son was born?
  22. 22.Magic square (every row, column and diagonal has the same total): 25 10 13 | 4 16 28 | ? 22 7. What is the missing number?
  23. 23.A piggy bank has 2 coins of ₹5 and 10 coins of ₹2. How many rupees are in it?
  24. 24.Double 43 =
  25. 25.9 × 7 = ?3 — what is the missing digit?
  26. 26.311 × 10 =
  27. 27.12 × 4 =
  28. 28.I thought of a number, added 3 and then doubled it. I got 24. What was my number?
  29. 29.Magic trick! Think of 4. Double it, add 4, halve it, then take away 4. What number do you get?
  30. 30.Half of 154 =
  31. 31.37 × 27 =
  32. 32.9 × 8 = ?2 — what is the missing digit?
  33. 33.I thought of a number, added 1 and then doubled it. I got 42. What was my number?
  34. 34.Magic square (every row, column and diagonal has the same total): ? 16 6 | 4 12 20 | 18 8 10. What is the missing number?
  35. 35.57 × 4 =
  36. 36.9 × 4 = ?6 — what is the missing digit?
  37. 37.79? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.Half of 126 =
  39. 39.Magic trick! Think of 11. Double it, add 14, halve it, then take away 11. What number do you get?
  40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?

Answer key

  1. 45
  2. 25
  3. 111
  4. 36
  5. 444444444
  6. 9
  7. 6
  8. 5
  9. 1089
  10. 1000
  11. 1
  12. 12
  13. 31
  14. 3
  15. 7
  16. Thursday
  17. 8
  18. 7
  19. 138
  20. 5
  21. 26
  22. 19
  23. 30
  24. 86
  25. 6
  26. 3110
  27. 48
  28. 9
  29. 2
  30. 77
  31. 999
  32. 7
  33. 20
  34. 14
  35. 228
  36. 3
  37. 2
  38. 63
  39. 7
  40. 297

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