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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 878 · 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 × 3 = 2? — what is the missing digit?
  2. 2.What comes next? 4, 9, 16, 25, ? (a) 34 (b) 37 (c) 38 (d) 36
  3. 3.?907 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  4. 4.1 + 3 + 5 + … + 29 =
  5. 5.If today is Monday, what day will it be after 99 days? (a) Tuesday (b) Friday (c) Monday (d) Wednesday
  6. 6.10 × 9 =
  7. 7.1 + 2 + 3 + … + 28 =
  8. 8.The ages of two twins add up to 16. How old is each twin?
  9. 9.1 × 9 =
  10. 10.12 × 9 + 3 =
  11. 11.9 × 9 =
  12. 12.9 × 3 =
  13. 13.42 × 1000 =
  14. 14.95 × 100 =
  15. 15.Half of 118 =
  16. 16.Think of 15. Multiply it by 3, then add 3. What number do you end with?
  17. 17.Magic square (every row, column and diagonal has the same total): 28 7 22 | 13 19 25 | ? 31 10. What is the missing number?
  18. 18.1?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.9 × 2 = ?8 — what is the missing digit?
  20. 20.49 × 4 =
  21. 21.9 × 3 = ?7 — what is the missing digit?
  22. 22.If today is Thursday, what day was it 12 days ago? (a) Friday (b) Tuesday (c) Saturday (d) Sunday
  23. 23.Magic square (every row, column and diagonal has the same total): 5 19 9 | 15 ? 7 | 13 3 17. What is the missing number?
  24. 24.198 + 891 =
  25. 25.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 66 (c) 62 (d) 64
  26. 26.Double 93 =
  27. 27.Take 431. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  28. 28.What comes next? 36, 49, 64, 81, ? (a) 100 (b) 101 (c) 102 (d) 98
  29. 29.374 × 10 =
  30. 30.In 6 years a boy will be 17 years old. How old was he 3 years ago?
  31. 31.9 × 2 = 1? — what is the missing digit?
  32. 32.Half of 82 =
  33. 33.549 × 10 =
  34. 34.Magic square (every row, column and diagonal has the same total): 12 7 14 | 13 11 9 | 8 15 ?. What is the missing number?
  35. 35.The ages of two twins add up to 8. How old is each twin?
  36. 36.Magic trick! Think of 7. Double it, add 8, halve it, then take away 7. What number do you get?
  37. 37.1 + 2 + 3 + … + 90 =
  38. 38.4 × 9 =
  39. 39.A piggy bank has 3 coins of ₹5 and 6 coins of ₹2. How many rupees are in it?
  40. 40.40 × 4 =

Answer key

  1. 7
  2. 36
  3. 2
  4. 225
  5. Tuesday
  6. 90
  7. 406
  8. 8
  9. 9
  10. 111
  11. 81
  12. 27
  13. 42000
  14. 9500
  15. 59
  16. 48
  17. 16
  18. 5
  19. 1
  20. 196
  21. 2
  22. Saturday
  23. 11
  24. 1089
  25. 64
  26. 186
  27. 297
  28. 100
  29. 3740
  30. 8
  31. 8
  32. 41
  33. 5490
  34. 10
  35. 4
  36. 4
  37. 4095
  38. 36
  39. 27
  40. 160

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