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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 860 · 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. 1.8 × 1000 =
  2. 2.Double 96 =
  3. 3.What comes next? 2, 4, 8, 16, ? (a) 28 (b) 33 (c) 24 (d) 32
  4. 4.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  5. 5.What comes next? 9, 18, 27, 36, ? (a) 54 (b) 45 (c) 46 (d) 36
  6. 6.1 + 2 + 3 + … + 54 =
  7. 7.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 3 years?
  8. 8.9 × 10 = ?0 — what is the missing digit?
  9. 9.Magic trick! Think of 7. Double it, add 12, halve it, then take away 7. What number do you get?
  10. 10.620? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.1 + 2 + 3 + … + 13 =
  12. 12.9 × 4 =
  13. 13.What comes next? 1, 2, 4, 8, ? (a) 17 (b) 12 (c) 16 (d) 14
  14. 14.7 × 9 =
  15. 15.36 × 1000 =
  16. 16.26 × 4 =
  17. 17.3 × 1000 =
  18. 18.Magic trick! Think of 7. Double it, add 6, halve it, then take away 7. What number do you get?
  19. 19.23 × ? = 23000
  20. 20.8 × ? = 800
  21. 21.The ages of two twins add up to 20. How old is each twin?
  22. 22.47 × 1000 =
  23. 23.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹25. How many ₹2 coins do you have?
  24. 24.1 + 3 + 5 + … + 17 =
  25. 25.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
  26. 26.What comes next? 4, 8, 16, 32, ? (a) 64 (b) 65 (c) 48 (d) 56
  27. 27.Half of 34 =
  28. 28.Half of 112 =
  29. 29.If today is Sunday, what day will it be after 24 days? (a) Saturday (b) Wednesday (c) Tuesday (d) Thursday
  30. 30.Take 40 and take away the sum of its digits. What do you get?
  31. 31.63 × 100 =
  32. 32.297 + 792 =
  33. 33.9 × 2 = 1? — what is the missing digit?
  34. 34.Magic square (every row, column and diagonal has the same total): 27 30 15 | 12 24 36 | 33 ? 21. What is the missing number?
  35. 35.14 × 4 =
  36. 36.The 9th of a month is a Tuesday. What day is the 30th of the same month? (a) Friday (b) Tuesday (c) Monday (d) Wednesday
  37. 37.9 × 4 = 3? — what is the missing digit?
  38. 38.Take 238. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.I thought of a number, multiplied it by 2 and added 6. I got 28. What was my number?
  40. 40.Double 41 =

Answer key

  1. 8000
  2. 192
  3. 32
  4. 891
  5. 45
  6. 1485
  7. 11
  8. 9
  9. 6
  10. 1
  11. 91
  12. 36
  13. 16
  14. 63
  15. 36000
  16. 104
  17. 3000
  18. 3
  19. 1000
  20. 100
  21. 10
  22. 47000
  23. 11
  24. 81
  25. 198
  26. 64
  27. 17
  28. 56
  29. Wednesday
  30. 36
  31. 6300
  32. 1089
  33. 8
  34. 18
  35. 56
  36. Tuesday
  37. 6
  38. 594
  39. 11
  40. 82

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