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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 221 · 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. 1.9 × 5 = ?5 — what is the missing digit?
  2. 2.1 + 2 + 3 + … + 23 =
  3. 3.I thought of a number, added 1 and then doubled it. I got 14. What was my number?
  4. 4.9 × 1 =
  5. 5.9 × 4 =
  6. 6.9 × 9 = ?1 — what is the missing digit?
  7. 7.701 × 10 =
  8. 8.Think of 9. Multiply it by 2, then add 8. What number do you end with?
  9. 9.A girl is 12 years old and her brother is 4 years older. How old will her brother be in 7 years?
  10. 10.Double 71 =
  11. 11.What comes next? 14, 18, 22, 26, ? (a) 31 (b) 26 (c) 34 (d) 30
  12. 12.I thought of a number, multiplied it by 5 and added 1. I got 31. What was my number?
  13. 13.What comes next? 9, 12, 15, 18, ? (a) 24 (b) 21 (c) 22 (d) 18
  14. 14.Double 52 =
  15. 15.Take 52 and take away the sum of its digits. What do you get?
  16. 16.9 × 3 =
  17. 17.A girl is 5 years old and her brother is 2 years older. How old will her brother be in 5 years?
  18. 18.12 × 4 =
  19. 19.45 × 4 =
  20. 20.A father is 33 years old and his son is 4. How old was the father when the son was born?
  21. 21.Take 135. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  22. 22.49 × 4 =
  23. 23.What comes next? 12, 15, 18, 21, ? (a) 25 (b) 21 (c) 27 (d) 24
  24. 24.1234567 × 8 + 7 =
  25. 25.What comes next? 2, 10, 18, 26, ? (a) 26 (b) 34 (c) 35 (d) 42
  26. 26.1 + 2 + 3 + … + 42 =
  27. 27.3 × 9 =
  28. 28.A father is 33 years old and his son is 6. How old was the father when the son was born?
  29. 29.The ages of two twins add up to 10. How old is each twin?
  30. 30.6?30 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  31. 31.Magic square (every row, column and diagonal has the same total): 22 ? 14 | 8 16 24 | 18 20 10. What is the missing number?
  32. 32.12345679 × 18 =
  33. 33.415 × ? = 4150
  34. 34.52 × 4 =
  35. 35.5 × 9 =
  36. 36.Magic square (every row, column and diagonal has the same total): 23 9 19 | 13 ? 21 | 15 25 11. What is the missing number?
  37. 37.9 × 4 = 3? — what is the missing digit?
  38. 38.598 × 10 =
  39. 39.9 × 10 =
  40. 40.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹18. How many ₹2 coins do you have?

Answer key

  1. 4
  2. 276
  3. 6
  4. 9
  5. 36
  6. 8
  7. 7010
  8. 26
  9. 23
  10. 142
  11. 30
  12. 6
  13. 21
  14. 104
  15. 45
  16. 27
  17. 12
  18. 48
  19. 180
  20. 29
  21. 396
  22. 196
  23. 24
  24. 9876543
  25. 34
  26. 903
  27. 27
  28. 27
  29. 5
  30. 9
  31. 12
  32. 222222222
  33. 10
  34. 208
  35. 45
  36. 17
  37. 6
  38. 5980
  39. 90
  40. 4

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