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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 138 · 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.Take 427. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  2. 2.Take 618. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  3. 3.Think of 3. Multiply it by 3, then add 6. What number do you end with?
  4. 4.What comes next? 3, 7, 11, 15, ? (a) 19 (b) 20 (c) 23 (d) 15
  5. 5.Odd one out: which number is NOT in the 4 times table? (a) 28 (b) 12 (c) 22 (d) 24
  6. 6.394 × 10 =
  7. 7.486 × ? = 4860
  8. 8.3 × 9 =
  9. 9.27 × 4 =
  10. 10.12345679 × 18 =
  11. 11.Half of 138 =
  12. 12.25 × 4 =
  13. 13.The 5th of a month is a Friday. What day is the 25th of the same month? (a) Wednesday (b) Sunday (c) Friday (d) Thursday
  14. 14.Take 16 and take away the sum of its digits. What do you get?
  15. 15.Half of 196 =
  16. 16.Think of 11. Multiply it by 5, then add 5. What number do you end with?
  17. 17.9 × 7 = 6? — what is the missing digit?
  18. 18.9 × 8 = ?2 — what is the missing digit?
  19. 19.Magic square (every row, column and diagonal has the same total): 13 8 9 | 6 10 14 | 11 ? 7. What is the missing number?
  20. 20.A piggy bank has 5 coins of ₹5 and 3 coins of ₹2. How many rupees are in it?
  21. 21.Magic square (every row, column and diagonal has the same total): ? 10 20 | 14 18 22 | 16 26 12. What is the missing number?
  22. 22.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹16. How many ₹2 coins do you have?
  23. 23.Magic square (every row, column and diagonal has the same total): 14 ? 26 | 35 23 11 | 20 17 32. What is the missing number?
  24. 24.59 × 4 =
  25. 25.5 × 9 =
  26. 26.Do the 1089 trick with 501: reverse and subtract, then reverse that answer and add. What do you get?
  27. 27.9 × 4 =
  28. 28.60 × 4 =
  29. 29.The ages of two twins add up to 12. How old is each twin?
  30. 30.The ages of two twins add up to 14. How old is each twin?
  31. 31.1234 × 9 + 5 =
  32. 32.9 × 5 = 4? — what is the missing digit?
  33. 33.Think of 5. Multiply it by 5, then add 9. What number do you end with?
  34. 34.If today is Saturday, what day will it be after 36 days? (a) Monday (b) Sunday (c) Saturday (d) Wednesday
  35. 35.9 × 9 =
  36. 36.What comes next? 3, 8, 13, 18, ? (a) 28 (b) 23 (c) 24 (d) 18
  37. 37.12 × 8 + 2 =
  38. 38.Take 449. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  39. 39.568 × 10 =
  40. 40.I thought of a number, multiplied it by 4 and added 1. I got 33. What was my number?

Answer key

  1. 297
  2. 198
  3. 15
  4. 19
  5. 22
  6. 3940
  7. 10
  8. 27
  9. 108
  10. 222222222
  11. 69
  12. 100
  13. Thursday
  14. 9
  15. 98
  16. 60
  17. 3
  18. 7
  19. 12
  20. 31
  21. 24
  22. 7
  23. 29
  24. 236
  25. 45
  26. 1089
  27. 36
  28. 240
  29. 6
  30. 7
  31. 11111
  32. 5
  33. 34
  34. Sunday
  35. 81
  36. 23
  37. 98
  38. 495
  39. 5680
  40. 8

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