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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 41 · 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.The ages of two twins add up to 30. How old is each twin?
  2. 2.12 × 9 + 3 =
  3. 3.If today is Wednesday, what day was it 44 days ago? (a) Tuesday (b) Thursday (c) Sunday (d) Monday
  4. 4.In 2 years a boy will be 14 years old. How old was he 6 years ago?
  5. 5.A father is 35 years old and his son is 4. How old was the father when the son was born?
  6. 6.A piggy bank has 3 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  7. 7.1 + 2 + 3 + … + 87 =
  8. 8.8 × 9 =
  9. 9.Half of 166 =
  10. 10.In 4 years a boy will be 12 years old. How old was he 3 years ago?
  11. 11.9 × 2 =
  12. 12.Odd one out: which number is NOT in the 5 times table? (a) 15 (b) 30 (c) 42 (d) 25
  13. 13.Take 86 and take away the sum of its digits. What do you get?
  14. 14.A girl is 6 years old and her brother is 5 years older. How old will her brother be in 4 years?
  15. 15.20 × 1000 =
  16. 16.31 × 4 =
  17. 17.Odd one out: which number is NOT in the 4 times table? (a) 8 (b) 16 (c) 11 (d) 12
  18. 18.Double 15 =
  19. 19.I thought of a number, added 2 and then doubled it. I got 10. What was my number?
  20. 20.Odd one out: which number is NOT in the 7 times table? (a) 14 (b) 39 (c) 42 (d) 28
  21. 21.In 5 years a boy will be 14 years old. How old was he 4 years ago?
  22. 22.43 × 4 =
  23. 23.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  24. 24.I thought of a number, multiplied it by 2 and added 5. I got 13. What was my number?
  25. 25.What comes next? 4, 9, 16, 25, ? (a) 37 (b) 34 (c) 38 (d) 36
  26. 26.Do the 1089 trick with 813: reverse and subtract, then reverse that answer and add. What do you get?
  27. 27.1 + 2 + 3 + … + 74 =
  28. 28.I thought of a number, multiplied it by 5 and added 5. I got 30. What was my number?
  29. 29.647 × ? = 6470
  30. 30.73 × ? = 730
  31. 31.9 × 5 = ?5 — what is the missing digit?
  32. 32.Half of 64 =
  33. 33.1111 × 1111 =
  34. 34.Magic trick! Think of 16. Double it, add 6, halve it, then take away 16. What number do you get?
  35. 35.43 × ? = 4300
  36. 36.935 × 10 =
  37. 37.9 × 4 =
  38. 38.9 × 10 = 9? — what is the missing digit?
  39. 39.15 × 4 =
  40. 40.9 × 6 = ?4 — what is the missing digit?

Answer key

  1. 15
  2. 111
  3. Monday
  4. 6
  5. 31
  6. 33
  7. 3828
  8. 72
  9. 83
  10. 5
  11. 18
  12. 42
  13. 72
  14. 15
  15. 20000
  16. 124
  17. 11
  18. 30
  19. 3
  20. 39
  21. 5
  22. 172
  23. 693
  24. 4
  25. 36
  26. 1089
  27. 2775
  28. 5
  29. 10
  30. 10
  31. 4
  32. 32
  33. 1234321
  34. 3
  35. 100
  36. 9350
  37. 36
  38. 0
  39. 60
  40. 5

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