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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 30 · 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.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 70 (c) 80 (d) 81
  2. 2.What comes next? 3, 6, 12, 24, ? (a) 49 (b) 48 (c) 42 (d) 36
  3. 3.Take 871. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  4. 4.12345678 × 8 + 8 =
  5. 5.12 × 4 =
  6. 6.9 × 8 =
  7. 7.What comes next? 1, 4, 9, 16, ? (a) 26 (b) 25 (c) 27 (d) 23
  8. 8.Magic square (every row, column and diagonal has the same total): 11 6 7 | 4 8 12 | ? 10 5. What is the missing number?
  9. 9.3 × 9 =
  10. 10.8 × 9 =
  11. 11.In 6 years a boy will be 14 years old. How old was he 4 years ago?
  12. 12.56 × 4 =
  13. 13.51 × 4 =
  14. 14.27 × ? = 2700
  15. 15.A piggy bank has 7 coins of ₹5 and 12 coins of ₹2. How many rupees are in it?
  16. 16.If today is Tuesday, what day will it be after 26 days? (a) Saturday (b) Wednesday (c) Sunday (d) Monday
  17. 17.Odd one out: which number is NOT in the 9 times table? (a) 63 (b) 54 (c) 36 (d) 21
  18. 18.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  19. 19.?880 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  20. 20.1 + 2 + 3 + … + 82 =
  21. 21.2 × 9 =
  22. 22.9 × 9 = 8? — what is the missing digit?
  23. 23.?097 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  24. 24.I thought of a number, added 3 and then doubled it. I got 12. What was my number?
  25. 25.Magic square (every row, column and diagonal has the same total): 12 33 18 | 27 21 ? | 24 9 30. What is the missing number?
  26. 26.12345679 × 54 =
  27. 27.Take 41 and take away the sum of its digits. What do you get?
  28. 28.9 × 5 = ?5 — what is the missing digit?
  29. 29.In 2 years a boy will be 15 years old. How old was he 2 years ago?
  30. 30.If today is Wednesday, what day was it 42 days ago? (a) Wednesday (b) Thursday (c) Saturday (d) Tuesday
  31. 31.1 + 3 + 5 + … + 31 =
  32. 32.143 × 10 =
  33. 33.80?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  34. 34.Half of 112 =
  35. 35.Double 31 =
  36. 36.Double 13 =
  37. 37.1 + 3 + 5 + … + 19 =
  38. 38.891 + 198 =
  39. 39.Magic square (every row, column and diagonal has the same total): 16 11 12 | ? 13 17 | 14 15 10. What is the missing number?
  40. 40.1 + 3 + 5 + … + 49 =

Answer key

  1. 80
  2. 48
  3. 693
  4. 98765432
  5. 48
  6. 72
  7. 25
  8. 9
  9. 27
  10. 72
  11. 4
  12. 224
  13. 204
  14. 100
  15. 59
  16. Sunday
  17. 21
  18. 1
  19. 2
  20. 3403
  21. 18
  22. 1
  23. 2
  24. 3
  25. 15
  26. 666666666
  27. 36
  28. 4
  29. 11
  30. Wednesday
  31. 256
  32. 1430
  33. 5
  34. 56
  35. 62
  36. 26
  37. 100
  38. 1089
  39. 9
  40. 625

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