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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 293 · 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.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 26 (c) 27 (d) 23
  2. 2.Odd one out: which number is NOT in the 5 times table? (a) 40 (b) 15 (c) 38 (d) 30
  3. 3.Magic square (every row, column and diagonal has the same total): 21 36 15 | 18 ? 30 | 33 12 27. What is the missing number?
  4. 4.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 82 (c) 79 (d) 81
  5. 5.Do the 1089 trick with 147: reverse and subtract, then reverse that answer and add. What do you get?
  6. 6.Magic square (every row, column and diagonal has the same total): 21 23 13 | 11 ? 27 | 25 15 17. What is the missing number?
  7. 7.Double 38 =
  8. 8.37 × 21 =
  9. 9.Take 720. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  10. 10.9 × 4 = ?6 — what is the missing digit?
  11. 11.Magic square (every row, column and diagonal has the same total): ? 12 27 | 18 24 30 | 21 36 15. What is the missing number?
  12. 12.13 × 1000 =
  13. 13.627 × ? = 6270
  14. 14.891 + 198 =
  15. 15.9 × 6 = ?4 — what is the missing digit?
  16. 16.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹7. How many ₹2 coins do you have?
  17. 17.4 × 1000 =
  18. 18.Magic square (every row, column and diagonal has the same total): ? 14 12 | 18 10 2 | 8 6 16. What is the missing number?
  19. 19.633 × 10 =
  20. 20.If today is Friday, what day was it 11 days ago? (a) Tuesday (b) Monday (c) Thursday (d) Sunday
  21. 21.50 × 4 =
  22. 22.A girl is 5 years old and her brother is 2 years older. How old will her brother be in 5 years?
  23. 23.1 + 3 + 5 + … + 33 =
  24. 24.40 × 4 =
  25. 25.Half of 154 =
  26. 26.I thought of a number, added 8 and then doubled it. I got 26. What was my number?
  27. 27.If today is Wednesday, what day will it be after 88 days? (a) Sunday (b) Saturday (c) Monday (d) Wednesday
  28. 28.I thought of a number, added 1 and then doubled it. I got 22. What was my number?
  29. 29.Take 730. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  30. 30.9 × 1 =
  31. 31.I thought of a number, added 2 and then doubled it. I got 44. What was my number?
  32. 32.32 × 100 =
  33. 33.9 × 9 =
  34. 34.1 + 2 + 3 + … + 90 =
  35. 35.8?27 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  36. 36.22 × 4 =
  37. 37.12 × 4 =
  38. 38.A girl is 9 years old and her brother is 3 years older. How old will her brother be in 9 years?
  39. 39.Magic square (every row, column and diagonal has the same total): 4 ? 8 | 9 5 1 | 2 7 6. What is the missing number?
  40. 40.12345678 × 8 + 8 =

Answer key

  1. 25
  2. 38
  3. 24
  4. 81
  5. 1089
  6. 19
  7. 76
  8. 777
  9. 693
  10. 3
  11. 33
  12. 13000
  13. 10
  14. 1089
  15. 5
  16. 1
  17. 4000
  18. 4
  19. 6330
  20. Monday
  21. 200
  22. 12
  23. 289
  24. 160
  25. 77
  26. 5
  27. Sunday
  28. 10
  29. 693
  30. 9
  31. 20
  32. 3200
  33. 81
  34. 4095
  35. 1
  36. 88
  37. 48
  38. 21
  39. 3
  40. 98765432

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