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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 248 · 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 81 =
  2. 2.891 + 198 =
  3. 3.9 × 9 =
  4. 4.9 × 7 = 6? — what is the missing digit?
  5. 5.Think of 11. Multiply it by 3, then add 1. What number do you end with?
  6. 6.21 × 4 =
  7. 7.123456 × 9 + 7 =
  8. 8.Double 86 =
  9. 9.Magic square (every row, column and diagonal has the same total): 11 ? 19 | 21 13 5 | 7 17 15. What is the missing number?
  10. 10.18 × 4 =
  11. 11.Double 41 =
  12. 12.The 5th of a month is a Friday. What day is the 20th of the same month? (a) Tuesday (b) Saturday (c) Sunday (d) Friday
  13. 13.Odd one out: which number is NOT in the 7 times table? (a) 49 (b) 42 (c) 28 (d) 17
  14. 14.11111 × 11111 =
  15. 15.What comes next? 4, 9, 16, 25, ? (a) 38 (b) 36 (c) 37 (d) 34
  16. 16.Magic trick! Think of 5. Double it, add 6, halve it, then take away 5. What number do you get?
  17. 17.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  18. 18.9 × 6 =
  19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  20. 20.1 + 2 + 3 + … + 45 =
  21. 21.289 × ? = 2890
  22. 22.4 × ? = 4000
  23. 23.The 5th of a month is a Monday. What day is the 13th of the same month? (a) Monday (b) Tuesday (c) Wednesday (d) Friday
  24. 24.12 × 8 + 2 =
  25. 25.9 × 3 =
  26. 26.47 × 4 =
  27. 27.1 + 3 + 5 + … + 29 =
  28. 28.9 × 2 = ?8 — what is the missing digit?
  29. 29.9 × 3 = ?7 — what is the missing digit?
  30. 30.24 × ? = 24000
  31. 31.Magic square (every row, column and diagonal has the same total): 14 11 26 | 29 17 5 | ? 23 20. What is the missing number?
  32. 32.Magic square (every row, column and diagonal has the same total): 10 11 6 | ? 9 13 | 12 7 8. What is the missing number?
  33. 33.If today is Friday, what day was it 48 days ago? (a) Tuesday (b) Saturday (c) Sunday (d) Friday
  34. 34.9 × 4 = 3? — what is the missing digit?
  35. 35.18 × ? = 1800
  36. 36.Double 71 =
  37. 37.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 27 (c) 25 (d) 23
  38. 38.Take 421. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.If today is Tuesday, what day was it 24 days ago? (a) Saturday (b) Sunday (c) Friday (d) Tuesday
  40. 40.I thought of a number, multiplied it by 2 and added 8. I got 32. What was my number?

Answer key

  1. 162
  2. 1089
  3. 81
  4. 3
  5. 34
  6. 84
  7. 1111111
  8. 172
  9. 9
  10. 72
  11. 82
  12. Saturday
  13. 17
  14. 123454321
  15. 36
  16. 3
  17. 4
  18. 54
  19. 297
  20. 1035
  21. 10
  22. 1000
  23. Tuesday
  24. 98
  25. 27
  26. 188
  27. 225
  28. 1
  29. 2
  30. 1000
  31. 8
  32. 5
  33. Saturday
  34. 6
  35. 100
  36. 142
  37. 25
  38. 297
  39. Saturday
  40. 12

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