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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 289 · 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. 1.396 + 693 =
  2. 2.Half of 112 =
  3. 3.Half of 16 =
  4. 4.Magic square (every row, column and diagonal has the same total): 5 12 7 | 10 ? 6 | 9 4 11. What is the missing number?
  5. 5.2 × 9 =
  6. 6.What comes next? 4, 9, 16, 25, ? (a) 34 (b) 36 (c) 37 (d) 38
  7. 7.In 3 years a boy will be 16 years old. How old was he 2 years ago?
  8. 8.1 + 3 + 5 + … + 33 =
  9. 9.39 × ? = 3900
  10. 10.1?06 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.Double 25 =
  12. 12.The 8th of a month is a Monday. What day is the 19th of the same month? (a) Thursday (b) Saturday (c) Monday (d) Friday
  13. 13.Magic square (every row, column and diagonal has the same total): ? 19 9 | 7 15 23 | 21 11 13. What is the missing number?
  14. 14.Do the 1089 trick with 245: reverse and subtract, then reverse that answer and add. What do you get?
  15. 15.3 × 9 =
  16. 16.347 × 10 =
  17. 17.9 × 3 = ?7 — what is the missing digit?
  18. 18.9 × 6 =
  19. 19.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
  20. 20.35 × 4 =
  21. 21.1 + 3 + 5 + … + 27 =
  22. 22.9 × 8 =
  23. 23.Magic square (every row, column and diagonal has the same total): 4 9 8 | 11 7 3 | 6 5 ?. What is the missing number?
  24. 24.What comes next? 3, 6, 12, 24, ? (a) 42 (b) 48 (c) 36 (d) 49
  25. 25.Half of 82 =
  26. 26.Magic square (every row, column and diagonal has the same total): 16 ? 28 | 31 19 7 | 10 25 22. What is the missing number?
  27. 27.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 12 (c) 16 (d) 17
  28. 28.37 × 3 =
  29. 29.?094 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.60?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.9 × 2 = ?8 — what is the missing digit?
  32. 32.Magic square (every row, column and diagonal has the same total): 14 4 18 | 16 12 8 | ? 20 10. What is the missing number?
  33. 33.Odd one out: which number is NOT in the 4 times table? (a) 16 (b) 20 (c) 12 (d) 15
  34. 34.9 × 3 =
  35. 35.Half of 116 =
  36. 36.A piggy bank has 2 coins of ₹5 and 4 coins of ₹2. How many rupees are in it?
  37. 37.66 × 100 =
  38. 38.12345679 × 27 =
  39. 39.21 × 4 =
  40. 40.8 × 9 =

Answer key

  1. 1089
  2. 56
  3. 8
  4. 8
  5. 18
  6. 36
  7. 11
  8. 289
  9. 100
  10. 2
  11. 50
  12. Friday
  13. 17
  14. 1089
  15. 27
  16. 3470
  17. 2
  18. 54
  19. 594
  20. 140
  21. 196
  22. 72
  23. 10
  24. 48
  25. 41
  26. 13
  27. 16
  28. 111
  29. 5
  30. 5
  31. 1
  32. 6
  33. 15
  34. 27
  35. 58
  36. 18
  37. 6600
  38. 333333333
  39. 84
  40. 72

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