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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 949 · 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. 1.1 + 3 + 5 + … + 27 =
  2. 2.I thought of a number, multiplied it by 4 and added 5. I got 25. What was my number?
  3. 3.52 × 4 =
  4. 4.44 × 4 =
  5. 5.60 × 4 =
  6. 6.9 × 8 = ?2 — what is the missing digit?
  7. 7.I thought of a number, added 2 and then doubled it. I got 30. What was my number?
  8. 8.38 × 4 =
  9. 9.308 × 10 =
  10. 10.If today is Saturday, what day will it be after 62 days? (a) Monday (b) Friday (c) Saturday (d) Thursday
  11. 11.What comes next? 17, 22, 27, 32, ? (a) 42 (b) 37 (c) 32 (d) 38
  12. 12.Take 19 and take away the sum of its digits. What do you get?
  13. 13.I thought of a number, added 6 and then doubled it. I got 36. What was my number?
  14. 14.A girl is 6 years old and her brother is 2 years older. How old will her brother be in 9 years?
  15. 15.9 × 9 = ?1 — what is the missing digit?
  16. 16.If today is Thursday, what day was it 18 days ago? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
  17. 17.9 × 9 =
  18. 18.Magic trick! Think of 20. Double it, add 14, halve it, then take away 20. What number do you get?
  19. 19.Magic square (every row, column and diagonal has the same total): 8 7 ? | 13 9 5 | 6 11 10. What is the missing number?
  20. 20.?762 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 65 (c) 64 (d) 66
  22. 22.8 × 9 =
  23. 23.5 × 9 =
  24. 24.48 × ? = 4800
  25. 25.47 × 4 =
  26. 26.2 × 100 =
  27. 27.What comes next? 11, 14, 17, 20, ? (a) 20 (b) 23 (c) 26 (d) 24
  28. 28.37 × 3 =
  29. 29.The 7th of a month is a Saturday. What day is the 27th of the same month? (a) Thursday (b) Friday (c) Monday (d) Saturday
  30. 30.47 × 1000 =
  31. 31.Half of 44 =
  32. 32.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 4 years?
  33. 33.Think of 13. Multiply it by 3, then add 2. What number do you end with?
  34. 34.Magic trick! Think of 20. Double it, add 8, halve it, then take away 20. What number do you get?
  35. 35.Do the 1089 trick with 812: reverse and subtract, then reverse that answer and add. What do you get?
  36. 36.In 5 years a boy will be 16 years old. How old was he 4 years ago?
  37. 37.Magic square (every row, column and diagonal has the same total): 2 7 6 | ? 5 1 | 4 3 8. What is the missing number?
  38. 38.?845 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹22. How many ₹2 coins do you have?
  40. 40.The 3rd of a month is a Sunday. What day is the 15th of the same month? (a) Friday (b) Thursday (c) Monday (d) Saturday

Answer key

  1. 196
  2. 5
  3. 208
  4. 176
  5. 240
  6. 7
  7. 13
  8. 152
  9. 3080
  10. Friday
  11. 37
  12. 9
  13. 12
  14. 17
  15. 8
  16. Sunday
  17. 81
  18. 7
  19. 12
  20. 3
  21. 64
  22. 72
  23. 45
  24. 100
  25. 188
  26. 200
  27. 23
  28. 111
  29. Friday
  30. 47000
  31. 22
  32. 15
  33. 41
  34. 4
  35. 1089
  36. 7
  37. 9
  38. 1
  39. 8
  40. Friday

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