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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 325 · 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.I thought of a number, added 5 and then doubled it. I got 30. What was my number?
  2. 2.Magic trick! Think of 11. Double it, add 4, halve it, then take away 11. What number do you get?
  3. 3.6 × 9 =
  4. 4.38 × ? = 3800
  5. 5.Magic square (every row, column and diagonal has the same total): 19 9 23 | ? 17 13 | 11 25 15. What is the missing number?
  6. 6.What comes next? 6, 12, 18, 24, ? (a) 36 (b) 31 (c) 24 (d) 30
  7. 7.Take 76 and take away the sum of its digits. What do you get?
  8. 8.A girl is 8 years old and her brother is 2 years older. How old will her brother be in 6 years?
  9. 9.Magic square (every row, column and diagonal has the same total): 31 16 19 | 10 22 34 | 25 28 ?. What is the missing number?
  10. 10.2 × 9 =
  11. 11.9 × 8 = 7? — what is the missing digit?
  12. 12.18 × 4 =
  13. 13.60?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  14. 14.Magic square (every row, column and diagonal has the same total): 7 17 15 | 21 13 5 | 11 9 ?. What is the missing number?
  15. 15.The ages of two twins add up to 8. How old is each twin?
  16. 16.What comes next? 1, 3, 5, 7, ? (a) 9 (b) 11 (c) 10 (d) 7
  17. 17.1234567 × 8 + 7 =
  18. 18.9 × 9 =
  19. 19.I thought of a number, added 2 and then doubled it. I got 12. What was my number?
  20. 20.9 × 5 = 4? — what is the missing digit?
  21. 21.You have 10 coins. Each coin is ₹1 or ₹2, and together they make ₹13. How many ₹2 coins do you have?
  22. 22.What comes next? 9, 16, 25, 36, ? (a) 49 (b) 47 (c) 50 (d) 51
  23. 23.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 33 (c) 28 (d) 32
  24. 24.In the 1089 trick, the subtraction gave a 3-digit number that starts with 3. What is that number?
  25. 25.Think of 2. Multiply it by 5, then add 4. What number do you end with?
  26. 26.I thought of a number, added 4 and then doubled it. I got 42. What was my number?
  27. 27.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 64 (c) 65 (d) 48
  28. 28.Double 38 =
  29. 29.19 × 1000 =
  30. 30.If today is Wednesday, what day will it be after 69 days? (a) Friday (b) Wednesday (c) Monday (d) Tuesday
  31. 31.Do the 1089 trick with 853: reverse and subtract, then reverse that answer and add. What do you get?
  32. 32.37 × 15 =
  33. 33.22 × 4 =
  34. 34.12 × 9 + 3 =
  35. 35.Odd one out: which number is NOT in the 3 times table? (a) 10 (b) 24 (c) 12 (d) 21
  36. 36.In 6 years a boy will be 14 years old. How old was he 4 years ago?
  37. 37.If today is Friday, what day will it be after 18 days? (a) Wednesday (b) Monday (c) Tuesday (d) Friday
  38. 38.24 × 100 =
  39. 39.What comes next? 6, 10, 14, 18, ? (a) 23 (b) 22 (c) 26 (d) 18
  40. 40.Think of 9. Multiply it by 2, then add 6. What number do you end with?

Answer key

  1. 10
  2. 2
  3. 54
  4. 100
  5. 21
  6. 30
  7. 63
  8. 16
  9. 13
  10. 18
  11. 2
  12. 72
  13. 2
  14. 19
  15. 4
  16. 9
  17. 9876543
  18. 81
  19. 4
  20. 5
  21. 3
  22. 49
  23. 32
  24. 396
  25. 14
  26. 17
  27. 64
  28. 76
  29. 19000
  30. Tuesday
  31. 1089
  32. 555
  33. 88
  34. 111
  35. 10
  36. 4
  37. Tuesday
  38. 2400
  39. 22
  40. 24

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