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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 288 · 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 + 2 + 3 + … + 52 =
  2. 2.Take 35 and take away the sum of its digits. What do you get?
  3. 3.9 × 9 =
  4. 4.564 × ? = 5640
  5. 5.58 × 4 =
  6. 6.812 × 10 =
  7. 7.What comes next? 14, 23, 32, 41, ? (a) 51 (b) 59 (c) 41 (d) 50
  8. 8.Take 23 and take away the sum of its digits. What do you get?
  9. 9.What comes next? 13, 21, 29, 37, ? (a) 37 (b) 53 (c) 46 (d) 45
  10. 10.Take 337. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  11. 11.55 × 4 =
  12. 12.9 × 7 =
  13. 13.Double 13 =
  14. 14.9 × 3 = ?7 — what is the missing digit?
  15. 15.A father is 36 years old and his son is 11. How old was the father when the son was born?
  16. 16.Do the 1089 trick with 980: reverse and subtract, then reverse that answer and add. What do you get?
  17. 17.12345679 × 72 =
  18. 18.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 12 (c) 16 (d) 17
  19. 19.Take 983. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  20. 20.1 + 2 + 3 + … + 98 =
  21. 21.The 3rd of a month is a Thursday. What day is the 23rd of the same month? (a) Thursday (b) Tuesday (c) Saturday (d) Wednesday
  22. 22.14 × 4 =
  23. 23.9 × 8 =
  24. 24.37 × 18 =
  25. 25.106 × 10 =
  26. 26.If today is Tuesday, what day will it be after 60 days? (a) Saturday (b) Friday (c) Sunday (d) Tuesday
  27. 27.9 × 3 =
  28. 28.Half of 14 =
  29. 29.54?2 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.?923 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Odd one out: which number is NOT in the 3 times table? (a) 11 (b) 12 (c) 27 (d) 18
  32. 32.?930 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.124 × ? = 1240
  34. 34.Double 68 =
  35. 35.396 + 693 =
  36. 36.44 × 100 =
  37. 37.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹16. How many ₹2 coins do you have?
  38. 38.12 × 8 + 2 =
  39. 39.51 × ? = 5100
  40. 40.Do the 1089 trick with 129: reverse and subtract, then reverse that answer and add. What do you get?

Answer key

  1. 1378
  2. 27
  3. 81
  4. 10
  5. 232
  6. 8120
  7. 50
  8. 18
  9. 45
  10. 396
  11. 220
  12. 63
  13. 26
  14. 2
  15. 25
  16. 1089
  17. 888888888
  18. 16
  19. 594
  20. 4851
  21. Wednesday
  22. 56
  23. 72
  24. 666
  25. 1060
  26. Saturday
  27. 27
  28. 7
  29. 7
  30. 4
  31. 11
  32. 6
  33. 10
  34. 136
  35. 1089
  36. 4400
  37. 6
  38. 98
  39. 100
  40. 1089

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