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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 817 · 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. 1.9 × 7 =
  2. 2.9 × 10 = 9? — what is the missing digit?
  3. 3.Take 51 and take away the sum of its digits. What do you get?
  4. 4.Magic trick! Think of 8. Double it, add 6, halve it, then take away 8. What number do you get?
  5. 5.10 × 4 =
  6. 6.1 + 2 + 3 + … + 74 =
  7. 7.Double 63 =
  8. 8.What comes next? 12, 14, 16, 18, ? (a) 22 (b) 18 (c) 21 (d) 20
  9. 9.?02 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
  11. 11.1 × 9 =
  12. 12.Double 29 =
  13. 13.20 × 4 =
  14. 14.145 × 10 =
  15. 15.45 × 4 =
  16. 16.Magic square (every row, column and diagonal has the same total): 15 30 27 | 36 24 12 | 21 ? 33. What is the missing number?
  17. 17.1 + 2 + 3 + … + 79 =
  18. 18.Magic square (every row, column and diagonal has the same total): 9 10 5 | 4 8 12 | ? 6 7. What is the missing number?
  19. 19.A father is 42 years old and his son is 5. How old was the father when the son was born?
  20. 20.12345679 × 72 =
  21. 21.139 × ? = 1390
  22. 22.9 × 4 =
  23. 23.Magic square (every row, column and diagonal has the same total): 19 21 11 | 9 ? 25 | 23 13 15. What is the missing number?
  24. 24.If today is Sunday, what day will it be after 88 days? (a) Sunday (b) Thursday (c) Friday (d) Wednesday
  25. 25.297 + 792 =
  26. 26.35 × 4 =
  27. 27.1 + 3 + 5 + … + 29 =
  28. 28.Take 960. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  29. 29.16 × 1000 =
  30. 30.Magic square (every row, column and diagonal has the same total): 8 7 ? | 13 9 5 | 6 11 10. What is the missing number?
  31. 31.Think of 6. Multiply it by 4, then add 1. What number do you end with?
  32. 32.Magic square (every row, column and diagonal has the same total): 7 12 5 | 6 8 10 | 11 ? 9. What is the missing number?
  33. 33.A piggy bank has 4 coins of ₹5 and 6 coins of ₹2. How many rupees are in it?
  34. 34.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 66 (c) 62 (d) 64
  35. 35.Odd one out: which number is NOT in the 3 times table? (a) 10 (b) 6 (c) 15 (d) 9
  36. 36.In 2 years a boy will be 16 years old. How old was he 4 years ago?
  37. 37.9 × 7 = 6? — what is the missing digit?
  38. 38.Half of 82 =
  39. 39.1 + 3 + 5 + … + 37 =
  40. 40.49 × 4 =

Answer key

  1. 63
  2. 0
  3. 45
  4. 3
  5. 40
  6. 2775
  7. 126
  8. 20
  9. 7
  10. 297
  11. 9
  12. 58
  13. 80
  14. 1450
  15. 180
  16. 18
  17. 3160
  18. 11
  19. 37
  20. 888888888
  21. 10
  22. 36
  23. 17
  24. Thursday
  25. 1089
  26. 140
  27. 225
  28. 891
  29. 16000
  30. 12
  31. 25
  32. 4
  33. 32
  34. 64
  35. 10
  36. 10
  37. 3
  38. 41
  39. 361
  40. 196

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