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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 137 · 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.Double 96 =
  2. 2.2 × ? = 2000
  3. 3.9 × 4 = ?6 — what is the missing digit?
  4. 4.Take 29 and take away the sum of its digits. What do you get?
  5. 5.9 × 6 =
  6. 6.9 × 9 = 8? — what is the missing digit?
  7. 7.82 × ? = 8200
  8. 8.9 × 10 = 9? — what is the missing digit?
  9. 9.Magic trick! Think of 20. Double it, add 14, halve it, then take away 20. What number do you get?
  10. 10.I thought of a number, added 3 and then doubled it. I got 36. What was my number?
  11. 11.The 2nd of a month is a Friday. What day is the 13th of the same month? (a) Wednesday (b) Friday (c) Tuesday (d) Monday
  12. 12.10 × 9 =
  13. 13.50 × 4 =
  14. 14.What comes next? 3, 10, 17, 24, ? (a) 38 (b) 24 (c) 31 (d) 32
  15. 15.1111 × 1111 =
  16. 16.58 × 100 =
  17. 17.In 5 years a boy will be 13 years old. How old was he 6 years ago?
  18. 18.3 × 9 =
  19. 19.What comes next? 9, 16, 25, 36, ? (a) 47 (b) 49 (c) 51 (d) 50
  20. 20.Double 93 =
  21. 21.5 × 9 =
  22. 22.A piggy bank has 12 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  23. 23.The ages of two twins add up to 28. How old is each twin?
  24. 24.198 + 891 =
  25. 25.Take 77 and take away the sum of its digits. What do you get?
  26. 26.415 × ? = 4150
  27. 27.14 × 4 =
  28. 28.The 9th of a month is a Monday. What day is the 28th of the same month? (a) Tuesday (b) Sunday (c) Friday (d) Saturday
  29. 29.1234567 × 9 + 8 =
  30. 30.9 × 8 = 7? — what is the missing digit?
  31. 31.Magic trick! Think of 15. Double it, add 8, halve it, then take away 15. What number do you get?
  32. 32.Double 66 =
  33. 33.Odd one out: which number is NOT in the 8 times table? (a) 32 (b) 40 (c) 48 (d) 44
  34. 34.A girl is 7 years old and her brother is 5 years older. How old will her brother be in 5 years?
  35. 35.9 × 4 =
  36. 36.What comes next? 15, 23, 31, 39, ? (a) 39 (b) 47 (c) 48 (d) 55
  37. 37.37 × ? = 3700
  38. 38.Double 94 =
  39. 39.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 4 years?
  40. 40.Magic trick! Think of 16. Double it, add 14, halve it, then take away 16. What number do you get?

Answer key

  1. 192
  2. 1000
  3. 3
  4. 18
  5. 54
  6. 1
  7. 100
  8. 0
  9. 7
  10. 15
  11. Tuesday
  12. 90
  13. 200
  14. 31
  15. 1234321
  16. 5800
  17. 2
  18. 27
  19. 49
  20. 186
  21. 45
  22. 88
  23. 14
  24. 1089
  25. 63
  26. 10
  27. 56
  28. Saturday
  29. 11111111
  30. 2
  31. 4
  32. 132
  33. 44
  34. 17
  35. 36
  36. 47
  37. 100
  38. 188
  39. 15
  40. 7

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