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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 680 · 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.The 4th of a month is a Sunday. What day is the 22nd of the same month? (a) Sunday (b) Friday (c) Wednesday (d) Thursday
  2. 2.1 + 2 + 3 + … + 96 =
  3. 3.The 7th of a month is a Saturday. What day is the 19th of the same month? (a) Thursday (b) Wednesday (c) Sunday (d) Friday
  4. 4.42 × 4 =
  5. 5.What comes next? 4, 9, 16, 25, ? (a) 37 (b) 36 (c) 34 (d) 38
  6. 6.A father is 39 years old and his son is 4. How old was the father when the son was born?
  7. 7.If today is Monday, what day was it 21 days ago? (a) Monday (b) Sunday (c) Thursday (d) Tuesday
  8. 8.1 + 3 + 5 + … + 9 =
  9. 9.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
  10. 10.The 1st of a month is a Wednesday. What day is the 26th of the same month? (a) Wednesday (b) Sunday (c) Saturday (d) Monday
  11. 11.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹23. How many ₹2 coins do you have?
  12. 12.Double 71 =
  13. 13.In 6 years a boy will be 16 years old. How old was he 7 years ago?
  14. 14.Odd one out: which number is NOT in the 4 times table? (a) 24 (b) 16 (c) 18 (d) 20
  15. 15.Half of 112 =
  16. 16.Magic square (every row, column and diagonal has the same total): 4 11 6 | ? 7 5 | 8 3 10. What is the missing number?
  17. 17.Magic square (every row, column and diagonal has the same total): ? 8 29 | 26 20 14 | 11 32 17. What is the missing number?
  18. 18.14 × 1000 =
  19. 19.Magic square (every row, column and diagonal has the same total): 9 14 7 | 8 10 12 | ? 6 11. What is the missing number?
  20. 20.6 × 4 =
  21. 21.Magic trick! Think of 4. Double it, add 18, halve it, then take away 4. What number do you get?
  22. 22.1 + 3 + 5 + … + 19 =
  23. 23.38 × 4 =
  24. 24.Take 88 and take away the sum of its digits. What do you get?
  25. 25.Think of 2. Multiply it by 3, then add 3. What number do you end with?
  26. 26.1 × 9 =
  27. 27.86?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  28. 28.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  29. 29.I thought of a number, added 8 and then doubled it. I got 54. What was my number?
  30. 30.A piggy bank has 6 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
  31. 31.43 × 4 =
  32. 32.Magic square (every row, column and diagonal has the same total): ? 19 9 | 15 11 7 | 13 3 17. What is the missing number?
  33. 33.23?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.A girl is 8 years old and her brother is 5 years older. How old will her brother be in 4 years?
  35. 35.9 × 9 =
  36. 36.7 × 9 =
  37. 37.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
  38. 38.If today is Saturday, what day will it be after 67 days? (a) Tuesday (b) Thursday (c) Saturday (d) Wednesday
  39. 39.9 × 6 = ?4 — what is the missing digit?
  40. 40.46 × ? = 46000

Answer key

  1. Thursday
  2. 4656
  3. Thursday
  4. 168
  5. 36
  6. 35
  7. Monday
  8. 25
  9. 1
  10. Sunday
  11. 8
  12. 142
  13. 3
  14. 18
  15. 56
  16. 9
  17. 23
  18. 14000
  19. 13
  20. 24
  21. 9
  22. 100
  23. 152
  24. 72
  25. 9
  26. 9
  27. 4
  28. 396
  29. 19
  30. 48
  31. 172
  32. 5
  33. 3
  34. 17
  35. 81
  36. 63
  37. 6
  38. Wednesday
  39. 5
  40. 1000

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