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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 520 · 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. 1.9 × 10 = 9? — what is the missing digit?
  2. 2.341 × 10 =
  3. 3.Take 990. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  4. 4.37 × 3 =
  5. 5.37 × 12 =
  6. 6.In 4 years a boy will be 18 years old. How old was he 7 years ago?
  7. 7.9 × 3 = 2? — what is the missing digit?
  8. 8.1 + 2 + 3 + … + 81 =
  9. 9.42 × 1000 =
  10. 10.Double 91 =
  11. 11.If today is Thursday, what day will it be after 71 days? (a) Friday (b) Saturday (c) Monday (d) Thursday
  12. 12.What comes next? 36, 49, 64, 81, ? (a) 101 (b) 102 (c) 100 (d) 98
  13. 13.9 × 5 =
  14. 14.51 × 4 =
  15. 15.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹21. How many ₹2 coins do you have?
  16. 16.If today is Tuesday, what day was it 17 days ago? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
  17. 17.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 4 years?
  18. 18.Magic square (every row, column and diagonal has the same total): ? 29 14 | 11 23 35 | 32 17 20. What is the missing number?
  19. 19.Odd one out: which number is NOT in the 6 times table? (a) 30 (b) 46 (c) 24 (d) 12
  20. 20.Magic square (every row, column and diagonal has the same total): 16 6 8 | 2 ? 18 | 12 14 4. What is the missing number?
  21. 21.33 × 4 =
  22. 22.1 + 2 + 3 + … + 58 =
  23. 23.9 × 1 =
  24. 24.37 × 27 =
  25. 25.14 × 4 =
  26. 26.If today is Thursday, what day was it 28 days ago? (a) Friday (b) Wednesday (c) Sunday (d) Thursday
  27. 27.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 79 (c) 82 (d) 81
  28. 28.32 × 1000 =
  29. 29.Double 57 =
  30. 30.12 × 9 + 3 =
  31. 31.Take 670. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  32. 32.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 48 (c) 64 (d) 65
  33. 33.35?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Double 43 =
  35. 35.9 × 3 =
  36. 36.9 × 2 = 1? — what is the missing digit?
  37. 37.123 × 8 + 3 =
  38. 38.What comes next? 8, 12, 16, 20, ? (a) 25 (b) 28 (c) 20 (d) 24
  39. 39.20 × 4 =
  40. 40.47 × 4 =

Answer key

  1. 0
  2. 3410
  3. 891
  4. 111
  5. 444
  6. 7
  7. 7
  8. 3321
  9. 42000
  10. 182
  11. Friday
  12. 100
  13. 45
  14. 204
  15. 10
  16. Saturday
  17. 12
  18. 26
  19. 46
  20. 10
  21. 132
  22. 1711
  23. 9
  24. 999
  25. 56
  26. Thursday
  27. 81
  28. 32000
  29. 114
  30. 111
  31. 594
  32. 64
  33. 2
  34. 86
  35. 27
  36. 8
  37. 987
  38. 24
  39. 80
  40. 188

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