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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 922 · 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.Think of 14. Multiply it by 5, then add 2. What number do you end with?
  2. 2.Think of 12. Multiply it by 4, then add 4. What number do you end with?
  3. 3.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹16. How many ₹2 coins do you have?
  4. 4.What comes next? 17, 24, 31, 38, ? (a) 38 (b) 45 (c) 52 (d) 46
  5. 5.5 × 9 =
  6. 6.10 × 9 =
  7. 7.14 × 100 =
  8. 8.804 × 10 =
  9. 9.Think of 13. Multiply it by 4, then add 3. What number do you end with?
  10. 10.Take 980. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  11. 11.What comes next? 18, 24, 30, 36, ? (a) 36 (b) 42 (c) 48 (d) 43
  12. 12.39 × 4 =
  13. 13.111111 × 111111 =
  14. 14.You have 6 coins. Each coin is ₹1 or ₹2, and together they make ₹7. How many ₹2 coins do you have?
  15. 15.Take 76 and take away the sum of its digits. What do you get?
  16. 16.9 × 2 = ?8 — what is the missing digit?
  17. 17.9 × 10 =
  18. 18.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  19. 19.Magic trick! Think of 18. Double it, add 6, halve it, then take away 18. What number do you get?
  20. 20.8 × ? = 8000
  21. 21.64?7 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  22. 22.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  23. 23.Odd one out: which number is NOT in the 4 times table? (a) 20 (b) 32 (c) 16 (d) 19
  24. 24.Think of 12. Multiply it by 2, then add 2. What number do you end with?
  25. 25.What comes next? 1, 2, 4, 8, ? (a) 12 (b) 16 (c) 14 (d) 17
  26. 26.I thought of a number, multiplied it by 2 and added 2. I got 24. What was my number?
  27. 27.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 24 (c) 28 (d) 32
  28. 28.1 + 3 + 5 + … + 23 =
  29. 29.69 × 100 =
  30. 30.9 × 9 = 8? — what is the missing digit?
  31. 31.1 + 2 + 3 + … + 90 =
  32. 32.Double 51 =
  33. 33.1 + 2 + 3 + … + 49 =
  34. 34.Do the 1089 trick with 389: reverse and subtract, then reverse that answer and add. What do you get?
  35. 35.7 × 1000 =
  36. 36.Magic trick! Think of 15. Double it, add 14, halve it, then take away 15. What number do you get?
  37. 37.9 × 7 =
  38. 38.If today is Saturday, what day will it be after 94 days? (a) Wednesday (b) Friday (c) Tuesday (d) Monday
  39. 39.21 × 4 =
  40. 40.217 × ? = 2170

Answer key

  1. 72
  2. 52
  3. 4
  4. 45
  5. 45
  6. 90
  7. 1400
  8. 8040
  9. 55
  10. 891
  11. 42
  12. 156
  13. 12345654321
  14. 1
  15. 63
  16. 1
  17. 90
  18. 693
  19. 3
  20. 1000
  21. 1
  22. 396
  23. 19
  24. 26
  25. 16
  26. 11
  27. 32
  28. 144
  29. 6900
  30. 1
  31. 4095
  32. 102
  33. 1225
  34. 1089
  35. 7000
  36. 7
  37. 63
  38. Tuesday
  39. 84
  40. 10

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