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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 370 · 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.A girl is 8 years old and her brother is 2 years older. How old will her brother be in 8 years?
  2. 2.35 × 4 =
  3. 3.7 × 9 =
  4. 4.37 × 24 =
  5. 5.Odd one out: which number is NOT in the 7 times table? (a) 67 (b) 63 (c) 28 (d) 42
  6. 6.If today is Thursday, what day will it be after 83 days? (a) Saturday (b) Tuesday (c) Wednesday (d) Thursday
  7. 7.A girl is 9 years old and her brother is 6 years older. How old will her brother be in 7 years?
  8. 8.9 × 10 =
  9. 9.Magic square (every row, column and diagonal has the same total): 17 14 ? | 32 20 8 | 11 26 23. What is the missing number?
  10. 10.1 + 2 + 3 + … + 85 =
  11. 11.396 + 693 =
  12. 12.796? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  13. 13.If today is Thursday, what day was it 18 days ago? (a) Wednesday (b) Sunday (c) Saturday (d) Monday
  14. 14.29 × 4 =
  15. 15.Magic square (every row, column and diagonal has the same total): 6 ? 10 | 16 12 8 | 14 4 18. What is the missing number?
  16. 16.I thought of a number, multiplied it by 5 and added 1. I got 21. What was my number?
  17. 17.37 × 6 =
  18. 18.1?70 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.Take 24 and take away the sum of its digits. What do you get?
  20. 20.594 + 495 =
  21. 21.9 × 3 = 2? — what is the missing digit?
  22. 22.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹6. How many ₹2 coins do you have?
  23. 23.76?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.Half of 158 =
  25. 25.Take 105. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  26. 26.Magic square (every row, column and diagonal has the same total): 6 20 10 | 16 12 8 | 14 4 ?. What is the missing number?
  27. 27.9 × 8 = 7? — what is the missing digit?
  28. 28.50 × 100 =
  29. 29.Think of 15. Multiply it by 2, then add 8. What number do you end with?
  30. 30.27 × 4 =
  31. 31.9 × 8 = ?2 — what is the missing digit?
  32. 32.Double 71 =
  33. 33.In the 1089 trick, the subtraction gave a 3-digit number that starts with 7. What is that number?
  34. 34.Half of 52 =
  35. 35.9 × 4 = ?6 — what is the missing digit?
  36. 36.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹10. How many ₹2 coins do you have?
  37. 37.A piggy bank has 10 coins of ₹5 and 11 coins of ₹2. How many rupees are in it?
  38. 38.Magic square (every row, column and diagonal has the same total): 9 23 13 | 19 15 11 | ? 7 21. What is the missing number?
  39. 39.Double 13 =
  40. 40.What comes next? 16, 25, 36, 49, ? (a) 66 (b) 65 (c) 62 (d) 64

Answer key

  1. 18
  2. 140
  3. 63
  4. 888
  5. 67
  6. Wednesday
  7. 22
  8. 90
  9. 29
  10. 3655
  11. 1089
  12. 5
  13. Sunday
  14. 116
  15. 20
  16. 4
  17. 222
  18. 1
  19. 18
  20. 1089
  21. 7
  22. 1
  23. 1
  24. 79
  25. 396
  26. 18
  27. 2
  28. 5000
  29. 38
  30. 108
  31. 7
  32. 142
  33. 792
  34. 26
  35. 3
  36. 3
  37. 72
  38. 17
  39. 26
  40. 64

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