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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 870 · 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. 1.6 × 9 =
  2. 2.30 × 4 =
  3. 3.Double 35 =
  4. 4.9 × 5 = 4? — what is the missing digit?
  5. 5.47?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.1 × 9 =
  7. 7.12 × 4 =
  8. 8.9 × 10 = ?0 — what is the missing digit?
  9. 9.50 × 4 =
  10. 10.2 × 9 =
  11. 11.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 42 (c) 49 (d) 48
  12. 12.9 × 4 = 3? — what is the missing digit?
  13. 13.9 × 4 = ?6 — what is the missing digit?
  14. 14.The 9th of a month is a Tuesday. What day is the 25th of the same month? (a) Sunday (b) Friday (c) Thursday (d) Wednesday
  15. 15.9 × 8 = ?2 — what is the missing digit?
  16. 16.23 × 4 =
  17. 17.12 × ? = 12000
  18. 18.1 + 2 + 3 + … + 94 =
  19. 19.Half of 62 =
  20. 20.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 33 (c) 32 (d) 24
  21. 21.Magic square (every row, column and diagonal has the same total): 5 19 9 | 15 11 ? | 13 3 17. What is the missing number?
  22. 22.779 × 10 =
  23. 23.9 × 2 =
  24. 24.7 × 9 =
  25. 25.11 × 11 =
  26. 26.I thought of a number, added 1 and then doubled it. I got 26. What was my number?
  27. 27.Magic trick! Think of 20. Double it, add 18, halve it, then take away 20. What number do you get?
  28. 28.9 × 10 =
  29. 29.?752 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.12345678 × 8 + 8 =
  31. 31.A piggy bank has 9 coins of ₹5 and 2 coins of ₹2. How many rupees are in it?
  32. 32.Think of 7. Multiply it by 3, then add 4. What number do you end with?
  33. 33.If today is Saturday, what day was it 55 days ago? (a) Saturday (b) Monday (c) Wednesday (d) Sunday
  34. 34.13 × ? = 13000
  35. 35.In 2 years a boy will be 13 years old. How old was he 6 years ago?
  36. 36.If today is Sunday, what day was it 46 days ago? (a) Saturday (b) Tuesday (c) Thursday (d) Wednesday
  37. 37.Take 980. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  38. 38.Take 48 and take away the sum of its digits. What do you get?
  39. 39.12345679 × 18 =
  40. 40.9 × 9 =

Answer key

  1. 54
  2. 120
  3. 70
  4. 5
  5. 4
  6. 9
  7. 48
  8. 9
  9. 200
  10. 18
  11. 48
  12. 6
  13. 3
  14. Thursday
  15. 7
  16. 92
  17. 1000
  18. 4465
  19. 31
  20. 32
  21. 7
  22. 7790
  23. 18
  24. 63
  25. 121
  26. 12
  27. 9
  28. 90
  29. 4
  30. 98765432
  31. 49
  32. 25
  33. Sunday
  34. 1000
  35. 5
  36. Wednesday
  37. 891
  38. 36
  39. 222222222
  40. 81

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