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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 494 · 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.Magic square (every row, column and diagonal has the same total): 7 2 ? | 8 6 4 | 3 10 5. What is the missing number?
  2. 2.14 × 4 =
  3. 3.37 × 24 =
  4. 4.I thought of a number, added 8 and then doubled it. I got 28. What was my number?
  5. 5.62 × 100 =
  6. 6.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  7. 7.A piggy bank has 7 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
  8. 8.Double 84 =
  9. 9.Odd one out: which number is NOT in the 7 times table? (a) 28 (b) 42 (c) 56 (d) 50
  10. 10.1 × 9 =
  11. 11.Double 16 =
  12. 12.Magic square (every row, column and diagonal has the same total): ? 8 18 | 20 12 4 | 6 16 14. What is the missing number?
  13. 13.422 × ? = 4220
  14. 14.Magic square (every row, column and diagonal has the same total): 19 16 31 | 34 22 ? | 13 28 25. What is the missing number?
  15. 15.Do the 1089 trick with 750: reverse and subtract, then reverse that answer and add. What do you get?
  16. 16.41 × 4 =
  17. 17.Double 69 =
  18. 18.27 × 100 =
  19. 19.594 + 495 =
  20. 20.22 × ? = 2200
  21. 21.Half of 112 =
  22. 22.?668 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.42 × 1000 =
  24. 24.9 × 9 = ?1 — what is the missing digit?
  25. 25.9 × 3 = 2? — what is the missing digit?
  26. 26.9 × 10 = 9? — what is the missing digit?
  27. 27.If today is Wednesday, what day will it be after 88 days? (a) Monday (b) Sunday (c) Wednesday (d) Saturday
  28. 28.12345679 × 63 =
  29. 29.Magic square (every row, column and diagonal has the same total): 4 3 8 | 9 ? 1 | 2 7 6. What is the missing number?
  30. 30.9 × 6 = ?4 — what is the missing digit?
  31. 31.29 × 4 =
  32. 32.In 5 years a boy will be 15 years old. How old was he 4 years ago?
  33. 33.What comes next? 3, 6, 12, 24, ? (a) 48 (b) 36 (c) 42 (d) 49
  34. 34.If today is Wednesday, what day was it 11 days ago? (a) Friday (b) Saturday (c) Tuesday (d) Sunday
  35. 35.If today is Monday, what day was it 46 days ago? (a) Thursday (b) Sunday (c) Wednesday (d) Friday
  36. 36.38 × ? = 3800
  37. 37.What comes next? 2, 5, 8, 11, ? (a) 15 (b) 14 (c) 11 (d) 17
  38. 38.1 + 3 + 5 + … + 15 =
  39. 39.Magic square (every row, column and diagonal has the same total): 15 36 21 | 30 ? 18 | 27 12 33. What is the missing number?
  40. 40.1234 × 9 + 5 =

Answer key

  1. 9
  2. 56
  3. 888
  4. 6
  5. 6200
  6. 297
  7. 57
  8. 168
  9. 50
  10. 9
  11. 32
  12. 10
  13. 10
  14. 10
  15. 1089
  16. 164
  17. 138
  18. 2700
  19. 1089
  20. 100
  21. 56
  22. 7
  23. 42000
  24. 8
  25. 7
  26. 0
  27. Sunday
  28. 777777777
  29. 5
  30. 5
  31. 116
  32. 6
  33. 48
  34. Saturday
  35. Thursday
  36. 100
  37. 14
  38. 64
  39. 24
  40. 11111

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