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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 726 · 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. 1.539 × 10 =
  2. 2.Do the 1089 trick with 920: reverse and subtract, then reverse that answer and add. What do you get?
  3. 3.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 12 (c) 16 (d) 14
  4. 4.11 × 11 =
  5. 5.47 × 4 =
  6. 6.What comes next? 3, 9, 15, 21, ? (a) 27 (b) 28 (c) 21 (d) 33
  7. 7.9 × 1 =
  8. 8.1 + 3 + 5 + … + 49 =
  9. 9.444 × ? = 4440
  10. 10.10 × 9 =
  11. 11.The 4th of a month is a Friday. What day is the 25th of the same month? (a) Monday (b) Friday (c) Saturday (d) Thursday
  12. 12.56 × 4 =
  13. 13.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  14. 14.50 × 100 =
  15. 15.If today is Thursday, what day was it 56 days ago? (a) Wednesday (b) Friday (c) Thursday (d) Sunday
  16. 16.9 × 10 = 9? — what is the missing digit?
  17. 17.Double 69 =
  18. 18.9 × 6 = ?4 — what is the missing digit?
  19. 19.57 × 4 =
  20. 20.297 + 792 =
  21. 21.Think of 10. Multiply it by 2, then add 7. What number do you end with?
  22. 22.29 × 4 =
  23. 23.Magic square (every row, column and diagonal has the same total): 7 12 5 | ? 8 10 | 11 4 9. What is the missing number?
  24. 24.What comes next? 4, 8, 16, 32, ? (a) 48 (b) 56 (c) 64 (d) 65
  25. 25.123 × 9 + 4 =
  26. 26.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  27. 27.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 23 (c) 26 (d) 27
  28. 28.26 × 100 =
  29. 29.What comes next? 12, 20, 28, 36, ? (a) 36 (b) 44 (c) 52 (d) 45
  30. 30.434 × 10 =
  31. 31.1 + 2 + 3 + … + 84 =
  32. 32.12345679 × 27 =
  33. 33.9 × 6 =
  34. 34.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
  35. 35.Take 22 and take away the sum of its digits. What do you get?
  36. 36.The ages of two twins add up to 12. How old is each twin?
  37. 37.1 + 3 + 5 + … + 15 =
  38. 38.52 × 100 =
  39. 39.62 × ? = 6200
  40. 40.Half of 162 =

Answer key

  1. 5390
  2. 1089
  3. 16
  4. 121
  5. 188
  6. 27
  7. 9
  8. 625
  9. 10
  10. 90
  11. Friday
  12. 224
  13. 792
  14. 5000
  15. Thursday
  16. 0
  17. 138
  18. 5
  19. 228
  20. 1089
  21. 27
  22. 116
  23. 6
  24. 64
  25. 1111
  26. 5
  27. 25
  28. 2600
  29. 44
  30. 4340
  31. 3570
  32. 333333333
  33. 54
  34. 3
  35. 18
  36. 6
  37. 64
  38. 5200
  39. 100
  40. 81

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