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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 247 · 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. 1.594 + 495 =
  2. 2.4 × 9 =
  3. 3.Magic square (every row, column and diagonal has the same total): 7 21 11 | 17 13 9 | 15 5 ?. What is the missing number?
  4. 4.9 × 3 = ?7 — what is the missing digit?
  5. 5.37 × 15 =
  6. 6.If today is Monday, what day was it 50 days ago? (a) Saturday (b) Wednesday (c) Monday (d) Sunday
  7. 7.Magic square (every row, column and diagonal has the same total): 4 14 12 | 18 10 2 | ? 6 16. What is the missing number?
  8. 8.9 × 6 =
  9. 9.55 × 4 =
  10. 10.The 6th of a month is a Monday. What day is the 30th of the same month? (a) Sunday (b) Thursday (c) Friday (d) Wednesday
  11. 11.50 × 4 =
  12. 12.Magic square (every row, column and diagonal has the same total): 16 18 8 | 6 14 22 | ? 10 12. What is the missing number?
  13. 13.46 × 4 =
  14. 14.1 + 2 + 3 + … + 64 =
  15. 15.Take 910. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  16. 16.Half of 56 =
  17. 17.Magic square (every row, column and diagonal has the same total): 14 29 8 | 11 17 ? | 26 5 20. What is the missing number?
  18. 18.40 × ? = 40000
  19. 19.The ages of two twins add up to 8. How old is each twin?
  20. 20.Magic trick! Think of 16. Double it, add 14, halve it, then take away 16. What number do you get?
  21. 21.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹16. How many ₹2 coins do you have?
  22. 22.Magic square (every row, column and diagonal has the same total): 13 8 15 | 14 12 10 | 9 ? 11. What is the missing number?
  23. 23.I thought of a number, multiplied it by 4 and added 8. I got 64. What was my number?
  24. 24.9 × 10 = 9? — what is the missing digit?
  25. 25.9 × 2 =
  26. 26.6 × ? = 6000
  27. 27.If today is Sunday, what day will it be after 55 days? (a) Sunday (b) Tuesday (c) Saturday (d) Friday
  28. 28.Magic square (every row, column and diagonal has the same total): 10 24 ? | 20 16 12 | 18 8 22. What is the missing number?
  29. 29.If today is Friday, what day was it 9 days ago? (a) Saturday (b) Wednesday (c) Tuesday (d) Thursday
  30. 30.Magic square (every row, column and diagonal has the same total): 7 8 3 | ? 6 10 | 9 4 5. What is the missing number?
  31. 31.Magic trick! Think of 4. Double it, add 14, halve it, then take away 4. What number do you get?
  32. 32.24 × 4 =
  33. 33.26 × 100 =
  34. 34.Do the 1089 trick with 299: reverse and subtract, then reverse that answer and add. What do you get?
  35. 35.12345679 × 54 =
  36. 36.10 × 10 =
  37. 37.Double 92 =
  38. 38.?028 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  39. 39.1234567 × 9 + 8 =
  40. 40.9 × 10 =

Answer key

  1. 1089
  2. 36
  3. 19
  4. 2
  5. 555
  6. Sunday
  7. 8
  8. 54
  9. 220
  10. Thursday
  11. 200
  12. 20
  13. 184
  14. 2080
  15. 891
  16. 28
  17. 23
  18. 1000
  19. 4
  20. 7
  21. 5
  22. 16
  23. 14
  24. 0
  25. 18
  26. 1000
  27. Saturday
  28. 14
  29. Wednesday
  30. 2
  31. 7
  32. 96
  33. 2600
  34. 1089
  35. 666666666
  36. 100
  37. 184
  38. 8
  39. 11111111
  40. 90

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