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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 504 · 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 × 9 =
  2. 2.The 6th of a month is a Wednesday. What day is the 14th of the same month? (a) Sunday (b) Thursday (c) Wednesday (d) Friday
  3. 3.Magic square (every row, column and diagonal has the same total): 18 4 14 | 8 ? 16 | 10 20 6. What is the missing number?
  4. 4.55 × 4 =
  5. 5.Double 28 =
  6. 6.123456 × 9 + 7 =
  7. 7.I thought of a number, added 2 and then doubled it. I got 26. What was my number?
  8. 8.9 × 7 = ?3 — what is the missing digit?
  9. 9.473 × 10 =
  10. 10.Do the 1089 trick with 950: reverse and subtract, then reverse that answer and add. What do you get?
  11. 11.198 + 891 =
  12. 12.204 × 10 =
  13. 13.Magic square (every row, column and diagonal has the same total): ? 7 17 | 19 11 3 | 5 15 13. What is the missing number?
  14. 14.If today is Monday, what day was it 37 days ago? (a) Saturday (b) Tuesday (c) Friday (d) Sunday
  15. 15.1234 × 9 + 5 =
  16. 16.41 × 4 =
  17. 17.9 × 9 = ?1 — what is the missing digit?
  18. 18.9 × 10 = 9? — what is the missing digit?
  19. 19.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 70 (c) 81 (d) 80
  20. 20.Double 73 =
  21. 21.4 × 9 =
  22. 22.Take 237. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  23. 23.Take 810. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  24. 24.6 × ? = 6000
  25. 25.Magic square (every row, column and diagonal has the same total): 28 13 16 | 7 19 31 | 22 25 ?. What is the missing number?
  26. 26.Think of 12. Multiply it by 5, then add 3. What number do you end with?
  27. 27.1 × 9 =
  28. 28.6 × 4 =
  29. 29.The ages of two twins add up to 12. How old is each twin?
  30. 30.1 + 2 + 3 + … + 36 =
  31. 31.If today is Wednesday, what day was it 53 days ago? (a) Saturday (b) Friday (c) Tuesday (d) Sunday
  32. 32.A piggy bank has 3 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  33. 33.12345679 × 54 =
  34. 34.8?40 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  35. 35.What comes next? 2, 4, 8, 16, ? (a) 32 (b) 28 (c) 33 (d) 24
  36. 36.9 × 6 = 5? — what is the missing digit?
  37. 37.A girl is 8 years old and her brother is 5 years older. How old will her brother be in 6 years?
  38. 38.1 + 2 + 3 + … + 66 =
  39. 39.Half of 122 =
  40. 40.The 3rd of a month is a Thursday. What day is the 27th of the same month? (a) Monday (b) Sunday (c) Saturday (d) Wednesday

Answer key

  1. 72
  2. Thursday
  3. 12
  4. 220
  5. 56
  6. 1111111
  7. 11
  8. 6
  9. 4730
  10. 1089
  11. 1089
  12. 2040
  13. 9
  14. Saturday
  15. 11111
  16. 164
  17. 8
  18. 0
  19. 80
  20. 146
  21. 36
  22. 495
  23. 792
  24. 1000
  25. 10
  26. 63
  27. 9
  28. 24
  29. 6
  30. 666
  31. Saturday
  32. 33
  33. 666666666
  34. 6
  35. 32
  36. 4
  37. 19
  38. 2211
  39. 61
  40. Sunday

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