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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 768 · 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 + 3 + 5 + … + 33 =
  2. 2.8 × 9 =
  3. 3.I thought of a number, multiplied it by 3 and added 5. I got 35. What was my number?
  4. 4.30 × 4 =
  5. 5.9 × 10 =
  6. 6.I thought of a number, multiplied it by 4 and added 8. I got 64. What was my number?
  7. 7.What comes next? 17, 23, 29, 35, ? (a) 41 (b) 42 (c) 47 (d) 35
  8. 8.Double 14 =
  9. 9.Think of 12. Multiply it by 5, then add 6. What number do you end with?
  10. 10.Magic square (every row, column and diagonal has the same total): 18 20 10 | ? 16 24 | 22 12 14. What is the missing number?
  11. 11.Odd one out: which number is NOT in the 7 times table? (a) 35 (b) 28 (c) 30 (d) 14
  12. 12.Think of 5. Multiply it by 4, then add 6. What number do you end with?
  13. 13.8?90 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.9 × 9 =
  15. 15.A girl is 7 years old and her brother is 6 years older. How old will her brother be in 2 years?
  16. 16.9 × 4 = 3? — what is the missing digit?
  17. 17.A girl is 12 years old and her brother is 4 years older. How old will her brother be in 8 years?
  18. 18.42 × 1000 =
  19. 19.9 × 3 = ?7 — what is the missing digit?
  20. 20.Half of 112 =
  21. 21.9 × 5 = 4? — what is the missing digit?
  22. 22.Double 71 =
  23. 23.9 × 10 = ?0 — what is the missing digit?
  24. 24.You have 15 coins. Each coin is ₹1 or ₹2, and together they make ₹28. How many ₹2 coins do you have?
  25. 25.44 × 100 =
  26. 26.I thought of a number, multiplied it by 3 and added 5. I got 23. What was my number?
  27. 27.Take 25 and take away the sum of its digits. What do you get?
  28. 28.1 + 3 + 5 + … + 23 =
  29. 29.Double 86 =
  30. 30.1 + 2 + 3 + … + 28 =
  31. 31.Magic square (every row, column and diagonal has the same total): 6 27 12 | 21 15 9 | 18 ? 24. What is the missing number?
  32. 32.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  33. 33.363 × 10 =
  34. 34.34 × 4 =
  35. 35.9 × 4 = ?6 — what is the missing digit?
  36. 36.9 × 2 = ?8 — what is the missing digit?
  37. 37.37 × 12 =
  38. 38.A piggy bank has 11 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  39. 39.6 × 100 =
  40. 40.1111 × 1111 =

Answer key

  1. 289
  2. 72
  3. 10
  4. 120
  5. 90
  6. 14
  7. 41
  8. 28
  9. 66
  10. 8
  11. 30
  12. 26
  13. 1
  14. 81
  15. 15
  16. 6
  17. 24
  18. 42000
  19. 2
  20. 56
  21. 5
  22. 142
  23. 9
  24. 13
  25. 4400
  26. 6
  27. 18
  28. 144
  29. 172
  30. 406
  31. 3
  32. 1
  33. 3630
  34. 136
  35. 3
  36. 1
  37. 444
  38. 81
  39. 600
  40. 1234321

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