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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 215 · 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. 1.94 × 100 =
  2. 2.142 × ? = 1420
  3. 3.9 × 4 = ?6 — what is the missing digit?
  4. 4.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 23 (c) 26 (d) 25
  5. 5.Think of 8. Multiply it by 3, then add 2. What number do you end with?
  6. 6.48 × 4 =
  7. 7.18 × 4 =
  8. 8.9 × 6 =
  9. 9.5?65 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  11. 11.18 × ? = 1800
  12. 12.A piggy bank has 5 coins of ₹5 and 6 coins of ₹2. How many rupees are in it?
  13. 13.8?91 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Think of 11. Multiply it by 2, then add 6. What number do you end with?
  15. 15.A piggy bank has 2 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  16. 16.Half of 116 =
  17. 17.9 × 7 = ?3 — what is the missing digit?
  18. 18.If today is Saturday, what day was it 23 days ago? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
  19. 19.Magic square (every row, column and diagonal has the same total): 8 13 12 | 15 11 7 | 10 9 ?. What is the missing number?
  20. 20.9 × 5 = ?5 — what is the missing digit?
  21. 21.A piggy bank has 11 coins of ₹5 and 12 coins of ₹2. How many rupees are in it?
  22. 22.1 + 2 + 3 + … + 42 =
  23. 23.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 3 years?
  24. 24.48 × ? = 48000
  25. 25.9 × 4 =
  26. 26.12 × 8 + 2 =
  27. 27.I thought of a number, multiplied it by 2 and added 6. I got 18. What was my number?
  28. 28.Take 81 and take away the sum of its digits. What do you get?
  29. 29.A father is 41 years old and his son is 6. How old was the father when the son was born?
  30. 30.37 × 18 =
  31. 31.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 36 (c) 49 (d) 42
  32. 32.37 × 3 =
  33. 33.40?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.In 2 years a boy will be 12 years old. How old was he 3 years ago?
  35. 35.9 × 3 = ?7 — what is the missing digit?
  36. 36.35?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.Think of 4. Multiply it by 3, then add 7. What number do you end with?
  38. 38.1 + 2 + 3 + … + 55 =
  39. 39.Double 11 =
  40. 40.3 × 9 =

Answer key

  1. 9400
  2. 10
  3. 3
  4. 25
  5. 26
  6. 192
  7. 72
  8. 54
  9. 2
  10. 792
  11. 100
  12. 37
  13. 9
  14. 28
  15. 16
  16. 58
  17. 6
  18. Thursday
  19. 14
  20. 4
  21. 79
  22. 903
  23. 11
  24. 1000
  25. 36
  26. 98
  27. 6
  28. 72
  29. 35
  30. 666
  31. 48
  32. 111
  33. 8
  34. 7
  35. 2
  36. 3
  37. 19
  38. 1540
  39. 22
  40. 27

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