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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 932 · 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.Double 96 =
  2. 2.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 65 (c) 64 (d) 48
  3. 3.628 × 10 =
  4. 4.?122 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  5. 5.Magic square (every row, column and diagonal has the same total): 12 11 16 | 17 13 9 | 10 15 ?. What is the missing number?
  6. 6.Do the 1089 trick with 730: reverse and subtract, then reverse that answer and add. What do you get?
  7. 7.What comes next? 25, 36, 49, 64, ? (a) 83 (b) 82 (c) 81 (d) 79
  8. 8.9 × 4 = 3? — what is the missing digit?
  9. 9.9 × 9 =
  10. 10.The ages of two twins add up to 28. How old is each twin?
  11. 11.24 × 4 =
  12. 12.A father is 30 years old and his son is 9. How old was the father when the son was born?
  13. 13.1 + 2 + 3 + … + 45 =
  14. 14.Think of 5. Multiply it by 2, then add 8. What number do you end with?
  15. 15.1 + 2 + 3 + … + 13 =
  16. 16.Take 45 and take away the sum of its digits. What do you get?
  17. 17.Do the 1089 trick with 186: reverse and subtract, then reverse that answer and add. What do you get?
  18. 18.Magic square (every row, column and diagonal has the same total): 27 30 15 | 12 24 36 | ? 18 21. What is the missing number?
  19. 19.12 × 4 =
  20. 20.12 × 8 + 2 =
  21. 21.9 × 6 =
  22. 22.Take 12 and take away the sum of its digits. What do you get?
  23. 23.9 × 5 = ?5 — what is the missing digit?
  24. 24.If today is Thursday, what day was it 15 days ago? (a) Saturday (b) Thursday (c) Wednesday (d) Tuesday
  25. 25.9 × 3 = 2? — what is the missing digit?
  26. 26.37 × 21 =
  27. 27.In 2 years a boy will be 16 years old. How old was he 4 years ago?
  28. 28.9 × 6 = ?4 — what is the missing digit?
  29. 29.9 × 5 =
  30. 30.Double 85 =
  31. 31.1 + 2 + 3 + … + 35 =
  32. 32.Magic square (every row, column and diagonal has the same total): 26 5 ? | 11 17 23 | 14 29 8. What is the missing number?
  33. 33.7?64 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Magic square (every row, column and diagonal has the same total): 8 9 4 | 3 ? 11 | 10 5 6. What is the missing number?
  35. 35.27 × 10 =
  36. 36.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹20. How many ₹2 coins do you have?
  37. 37.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 17 (c) 16 (d) 12
  38. 38.The 2nd of a month is a Sunday. What day is the 24th of the same month? (a) Tuesday (b) Thursday (c) Monday (d) Sunday
  39. 39.8 × 4 =
  40. 40.If today is Monday, what day will it be after 42 days? (a) Tuesday (b) Monday (c) Sunday (d) Thursday

Answer key

  1. 192
  2. 64
  3. 6280
  4. 4
  5. 14
  6. 1089
  7. 81
  8. 6
  9. 81
  10. 14
  11. 96
  12. 21
  13. 1035
  14. 18
  15. 91
  16. 36
  17. 1089
  18. 33
  19. 48
  20. 98
  21. 54
  22. 9
  23. 4
  24. Wednesday
  25. 7
  26. 777
  27. 10
  28. 5
  29. 45
  30. 170
  31. 630
  32. 20
  33. 1
  34. 7
  35. 270
  36. 8
  37. 16
  38. Monday
  39. 32
  40. Monday

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