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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 297 · 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? 4, 8, 16, 32, ? (a) 65 (b) 64 (c) 48 (d) 56
  2. 2.Magic trick! Think of 2. Double it, add 10, halve it, then take away 2. What number do you get?
  3. 3.9 × 8 = ?2 — what is the missing digit?
  4. 4.7 × 9 =
  5. 5.Double 69 =
  6. 6.I thought of a number, multiplied it by 2 and added 7. I got 21. What was my number?
  7. 7.1 × 9 =
  8. 8.Magic square (every row, column and diagonal has the same total): 11 18 13 | 16 14 12 | 15 ? 17. What is the missing number?
  9. 9.I thought of a number, added 9 and then doubled it. I got 44. What was my number?
  10. 10.The ages of two twins add up to 26. How old is each twin?
  11. 11.3?86 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  12. 12.9 × 8 =
  13. 13.If today is Thursday, what day will it be after 48 days? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
  14. 14.Odd one out: which number is NOT in the 7 times table? (a) 21 (b) 16 (c) 56 (d) 35
  15. 15.123456 × 8 + 6 =
  16. 16.Odd one out: which number is NOT in the 8 times table? (a) 48 (b) 74 (c) 32 (d) 40
  17. 17.92? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  18. 18.Think of 5. Multiply it by 2, then add 9. What number do you end with?
  19. 19.12345679 × 81 =
  20. 20.The 6th of a month is a Monday. What day is the 30th of the same month? (a) Thursday (b) Wednesday (c) Sunday (d) Friday
  21. 21.9 × 9 =
  22. 22.12 × 9 + 3 =
  23. 23.Magic trick! Think of 4. Double it, add 4, halve it, then take away 4. What number do you get?
  24. 24.1 + 2 + 3 + … + 24 =
  25. 25.1 + 2 + 3 + … + 25 =
  26. 26.26 × 1000 =
  27. 27.1234567 × 8 + 7 =
  28. 28.Take 67 and take away the sum of its digits. What do you get?
  29. 29.The 4th of a month is a Wednesday. What day is the 15th of the same month? (a) Wednesday (b) Monday (c) Saturday (d) Sunday
  30. 30.The 5th of a month is a Sunday. What day is the 26th of the same month? (a) Saturday (b) Wednesday (c) Sunday (d) Monday
  31. 31.789 × ? = 7890
  32. 32.If today is Thursday, what day will it be after 94 days? (a) Wednesday (b) Monday (c) Sunday (d) Saturday
  33. 33.Odd one out: which number is NOT in the 7 times table? (a) 42 (b) 21 (c) 28 (d) 48
  34. 34.9 × 4 =
  35. 35.89 × ? = 890
  36. 36.9 × 6 =
  37. 37.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹8. How many ₹2 coins do you have?
  38. 38.Take 20 and take away the sum of its digits. What do you get?
  39. 39.866 × 10 =
  40. 40.1 + 2 + 3 + … + 16 =

Answer key

  1. 64
  2. 5
  3. 7
  4. 63
  5. 138
  6. 7
  7. 9
  8. 10
  9. 13
  10. 13
  11. 1
  12. 72
  13. Wednesday
  14. 16
  15. 987654
  16. 74
  17. 7
  18. 19
  19. 999999999
  20. Thursday
  21. 81
  22. 111
  23. 2
  24. 300
  25. 325
  26. 26000
  27. 9876543
  28. 54
  29. Sunday
  30. Sunday
  31. 10
  32. Sunday
  33. 48
  34. 36
  35. 10
  36. 54
  37. 1
  38. 18
  39. 8660
  40. 136

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