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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 956 · 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 × 4 =
  2. 2.Think of 11. Multiply it by 3, then add 6. What number do you end with?
  3. 3.I thought of a number, added 2 and then doubled it. I got 38. What was my number?
  4. 4.9 × 8 = 7? — what is the missing digit?
  5. 5.805 × 10 =
  6. 6.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 28 (c) 33 (d) 32
  7. 7.What comes next? 13, 19, 25, 31, ? (a) 38 (b) 37 (c) 43 (d) 31
  8. 8.Do the 1089 trick with 970: reverse and subtract, then reverse that answer and add. What do you get?
  9. 9.111 × 111 =
  10. 10.7?62 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  11. 11.If today is Tuesday, what day will it be after 80 days? (a) Thursday (b) Saturday (c) Friday (d) Monday
  12. 12.Double 44 =
  13. 13.43 × 4 =
  14. 14.I thought of a number, added 8 and then doubled it. I got 46. What was my number?
  15. 15.Magic square (every row, column and diagonal has the same total): 19 5 15 | 9 13 ? | 11 21 7. What is the missing number?
  16. 16.?307 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  17. 17.51 × 4 =
  18. 18.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
  19. 19.693 + 396 =
  20. 20.9 × 5 = 4? — what is the missing digit?
  21. 21.37 × 15 =
  22. 22.If today is Saturday, what day will it be after 95 days? (a) Thursday (b) Tuesday (c) Wednesday (d) Saturday
  23. 23.I thought of a number, added 6 and then doubled it. I got 18. What was my number?
  24. 24.The ages of two twins add up to 30. How old is each twin?
  25. 25.123 × 9 + 4 =
  26. 26.25 × 4 =
  27. 27.9 × 5 =
  28. 28.1 + 2 + 3 + … + 34 =
  29. 29.1 + 2 + 3 + … + 82 =
  30. 30.Odd one out: which number is NOT in the 7 times table? (a) 32 (b) 21 (c) 42 (d) 49
  31. 31.If today is Wednesday, what day will it be after 20 days? (a) Monday (b) Tuesday (c) Wednesday (d) Friday
  32. 32.What comes next? 16, 22, 28, 34, ? (a) 41 (b) 40 (c) 46 (d) 34
  33. 33.A father is 45 years old and his son is 13. How old was the father when the son was born?
  34. 34.29 × 4 =
  35. 35.50 × 4 =
  36. 36.?705 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.I thought of a number, multiplied it by 3 and added 6. I got 24. What was my number?
  38. 38.12345679 × 18 =
  39. 39.Magic square (every row, column and diagonal has the same total): 8 22 12 | 18 14 10 | ? 6 20. What is the missing number?
  40. 40.Double 26 =

Answer key

  1. 36
  2. 39
  3. 17
  4. 2
  5. 8050
  6. 32
  7. 37
  8. 1089
  9. 12321
  10. 3
  11. Friday
  12. 88
  13. 172
  14. 15
  15. 17
  16. 8
  17. 204
  18. 693
  19. 1089
  20. 5
  21. 555
  22. Wednesday
  23. 3
  24. 15
  25. 1111
  26. 100
  27. 45
  28. 595
  29. 3403
  30. 32
  31. Tuesday
  32. 40
  33. 32
  34. 116
  35. 200
  36. 6
  37. 6
  38. 222222222
  39. 16
  40. 52

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