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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 959 · 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.You have 8 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  2. 2.8 × 4 =
  3. 3.Think of 11. Multiply it by 3, then add 6. What number do you end with?
  4. 4.1 × 9 =
  5. 5.46 × 4 =
  6. 6.In 3 years a boy will be 16 years old. How old was he 2 years ago?
  7. 7.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹16. How many ₹2 coins do you have?
  8. 8.39 × 4 =
  9. 9.Take 725. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  10. 10.1 + 2 + 3 + … + 37 =
  11. 11.2 × 9 =
  12. 12.6 × 9 =
  13. 13.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
  14. 14.Odd one out: which number is NOT in the 5 times table? (a) 35 (b) 20 (c) 18 (d) 15
  15. 15.Magic square (every row, column and diagonal has the same total): 13 23 ? | 27 19 11 | 17 15 25. What is the missing number?
  16. 16.24 × 100 =
  17. 17.Take 470. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  18. 18.1 + 2 + 3 + … + 19 =
  19. 19.7 × 9 =
  20. 20.Magic square (every row, column and diagonal has the same total): ? 14 9 | 8 12 16 | 15 10 11. What is the missing number?
  21. 21.9 × 9 =
  22. 22.?301 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  23. 23.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 102 (c) 101 (d) 100
  24. 24.50?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  25. 25.1 + 3 + 5 + … + 45 =
  26. 26.38 × ? = 3800
  27. 27.12 × 4 =
  28. 28.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹18. How many ₹2 coins do you have?
  29. 29.Double 39 =
  30. 30.What comes next? 5, 10, 20, 40, ? (a) 81 (b) 70 (c) 80 (d) 60
  31. 31.If today is Monday, what day will it be after 54 days? (a) Saturday (b) Friday (c) Tuesday (d) Sunday
  32. 32.12345679 × 18 =
  33. 33.Magic square (every row, column and diagonal has the same total): 14 11 26 | ? 17 5 | 8 23 20. What is the missing number?
  34. 34.The ages of two twins add up to 12. How old is each twin?
  35. 35.Double 11 =
  36. 36.12 × 8 + 2 =
  37. 37.I thought of a number, added 3 and then doubled it. I got 42. What was my number?
  38. 38.Think of 8. Multiply it by 3, then add 3. What number do you end with?
  39. 39.9 × 7 =
  40. 40.9 × 5 =

Answer key

  1. 5
  2. 32
  3. 39
  4. 9
  5. 184
  6. 11
  7. 4
  8. 156
  9. 198
  10. 703
  11. 18
  12. 54
  13. 495
  14. 18
  15. 21
  16. 2400
  17. 396
  18. 190
  19. 63
  20. 13
  21. 81
  22. 5
  23. 100
  24. 4
  25. 529
  26. 100
  27. 48
  28. 4
  29. 78
  30. 80
  31. Saturday
  32. 222222222
  33. 29
  34. 6
  35. 22
  36. 98
  37. 18
  38. 27
  39. 63
  40. 45

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