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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 86 · 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.Magic square (every row, column and diagonal has the same total): 27 30 15 | ? 24 36 | 33 18 21. What is the missing number?
  2. 2.You have 5 coins. Each coin is ₹1 or ₹2, and together they make ₹9. How many ₹2 coins do you have?
  3. 3.Half of 186 =
  4. 4.9 × 2 =
  5. 5.10 × 1000 =
  6. 6.Half of 128 =
  7. 7.Magic square (every row, column and diagonal has the same total): ? 14 24 | 26 18 10 | 12 22 20. What is the missing number?
  8. 8.12345679 × 54 =
  9. 9.What comes next? 15, 23, 31, 39, ? (a) 48 (b) 39 (c) 47 (d) 55
  10. 10.9 × 3 =
  11. 11.1 + 3 + 5 + … + 33 =
  12. 12.9 × 3 = ?7 — what is the missing digit?
  13. 13.Magic square (every row, column and diagonal has the same total): 11 25 15 | ? 17 13 | 19 9 23. What is the missing number?
  14. 14.9 × 7 = ?3 — what is the missing digit?
  15. 15.Magic square (every row, column and diagonal has the same total): 26 29 14 | 11 23 35 | 32 ? 20. What is the missing number?
  16. 16.1 + 2 + 3 + … + 78 =
  17. 17.9 × 9 =
  18. 18.2?98 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  19. 19.The ages of two twins add up to 16. How old is each twin?
  20. 20.?523 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  21. 21.9 × 1 =
  22. 22.Double 61 =
  23. 23.Magic square (every row, column and diagonal has the same total): 6 5 ? | 11 7 3 | 4 9 8. What is the missing number?
  24. 24.Magic trick! Think of 6. Double it, add 16, halve it, then take away 6. What number do you get?
  25. 25.8?77 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  26. 26.If today is Monday, what day will it be after 86 days? (a) Saturday (b) Tuesday (c) Thursday (d) Wednesday
  27. 27.32 × 4 =
  28. 28.Magic trick! Think of 16. Double it, add 14, halve it, then take away 16. What number do you get?
  29. 29.2 × 9 =
  30. 30.Take 67 and take away the sum of its digits. What do you get?
  31. 31.1 + 3 + 5 + … + 35 =
  32. 32.?22 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  33. 33.What comes next? 1, 2, 4, 8, ? (a) 16 (b) 14 (c) 12 (d) 17
  34. 34.Odd one out: which number is NOT in the 3 times table? (a) 15 (b) 9 (c) 12 (d) 10
  35. 35.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹18. How many ₹2 coins do you have?
  36. 36.44?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  37. 37.6?80 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  38. 38.1 + 2 + 3 + … + 53 =
  39. 39.9 × 2 = 1? — what is the missing digit?
  40. 40.What comes next? 1, 4, 9, 16, ? (a) 25 (b) 26 (c) 23 (d) 27

Answer key

  1. 12
  2. 4
  3. 93
  4. 18
  5. 10000
  6. 64
  7. 16
  8. 666666666
  9. 47
  10. 27
  11. 289
  12. 2
  13. 21
  14. 6
  15. 17
  16. 3081
  17. 81
  18. 8
  19. 8
  20. 8
  21. 9
  22. 122
  23. 10
  24. 8
  25. 5
  26. Wednesday
  27. 128
  28. 7
  29. 18
  30. 54
  31. 324
  32. 5
  33. 16
  34. 10
  35. 5
  36. 6
  37. 4
  38. 1431
  39. 8
  40. 25

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