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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 976 · 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 × 2 = 1? — what is the missing digit?
  2. 2.11111 × 11111 =
  3. 3.1 + 2 + 3 + … + 92 =
  4. 4.9 × 1 =
  5. 5.37 × 4 =
  6. 6.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 48 (c) 36 (d) 42
  7. 7.Magic square (every row, column and diagonal has the same total): 13 6 11 | 8 10 12 | 9 ? 7. What is the missing number?
  8. 8.Magic trick! Think of 9. Double it, add 16, halve it, then take away 9. What number do you get?
  9. 9.A piggy bank has 2 coins of ₹5 and 6 coins of ₹2. How many rupees are in it?
  10. 10.9 × 100 =
  11. 11.60 × 4 =
  12. 12.A piggy bank has 4 coins of ₹5 and 14 coins of ₹2. How many rupees are in it?
  13. 13.I thought of a number, multiplied it by 5 and added 1. I got 46. What was my number?
  14. 14.42 × 4 =
  15. 15.1234567 × 8 + 7 =
  16. 16.The ages of two twins add up to 20. How old is each twin?
  17. 17.?220 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.I thought of a number, added 9 and then doubled it. I got 46. What was my number?
  19. 19.1 + 2 + 3 + … + 89 =
  20. 20.Take 692. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  21. 21.9 × 8 = ?2 — what is the missing digit?
  22. 22.4 × 9 =
  23. 23.If today is Monday, what day will it be after 29 days? (a) Monday (b) Tuesday (c) Wednesday (d) Friday
  24. 24.What comes next? 5, 10, 20, 40, ? (a) 70 (b) 80 (c) 60 (d) 81
  25. 25.9 × 7 =
  26. 26.Double 93 =
  27. 27.Think of 10. Multiply it by 5, then add 7. What number do you end with?
  28. 28.123456 × 8 + 6 =
  29. 29.A father is 42 years old and his son is 7. How old was the father when the son was born?
  30. 30.1 + 2 + 3 + … + 28 =
  31. 31.265 × ? = 2650
  32. 32.I thought of a number, multiplied it by 5 and added 6. I got 71. What was my number?
  33. 33.878 × 10 =
  34. 34.What comes next? 4, 8, 16, 32, ? (a) 65 (b) 48 (c) 64 (d) 56
  35. 35.12345679 × 54 =
  36. 36.If today is Tuesday, what day will it be after 91 days? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
  37. 37.31 × 4 =
  38. 38.673 × ? = 6730
  39. 39.9 × 3 =
  40. 40.1 + 3 + 5 + … + 11 =

Answer key

  1. 8
  2. 123454321
  3. 4278
  4. 9
  5. 148
  6. 48
  7. 14
  8. 8
  9. 22
  10. 900
  11. 240
  12. 48
  13. 9
  14. 168
  15. 9876543
  16. 10
  17. 5
  18. 14
  19. 4005
  20. 396
  21. 7
  22. 36
  23. Tuesday
  24. 80
  25. 63
  26. 186
  27. 57
  28. 987654
  29. 35
  30. 406
  31. 10
  32. 13
  33. 8780
  34. 64
  35. 666666666
  36. Tuesday
  37. 124
  38. 10
  39. 27
  40. 36

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