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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 123 · 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? 9, 12, 15, 18, ? (a) 22 (b) 24 (c) 21 (d) 18
  2. 2.Magic square (every row, column and diagonal has the same total): 16 6 8 | 2 10 18 | 12 14 ?. What is the missing number?
  3. 3.I thought of a number, added 6 and then doubled it. I got 44. What was my number?
  4. 4.1 + 2 + 3 + … + 87 =
  5. 5.9 × 3 = 2? — what is the missing digit?
  6. 6.361? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  7. 7.11 × 11 =
  8. 8.What comes next? 4, 13, 22, 31, ? (a) 49 (b) 31 (c) 41 (d) 40
  9. 9.Take 56 and take away the sum of its digits. What do you get?
  10. 10.891 + 198 =
  11. 11.9 × 2 =
  12. 12.What comes next? 13, 17, 21, 25, ? (a) 33 (b) 25 (c) 29 (d) 30
  13. 13.79 × ? = 7900
  14. 14.Magic square (every row, column and diagonal has the same total): 27 30 15 | ? 24 36 | 33 18 21. What is the missing number?
  15. 15.8 × 9 =
  16. 16.9 × 5 = 4? — what is the missing digit?
  17. 17.203 × ? = 2030
  18. 18.56 × 4 =
  19. 19.1 + 2 + 3 + … + 9 =
  20. 20.345 × ? = 3450
  21. 21.Take 36 and take away the sum of its digits. What do you get?
  22. 22.1 + 2 + 3 + … + 35 =
  23. 23.9 × 3 = ?7 — what is the missing digit?
  24. 24.A piggy bank has 12 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
  25. 25.9 × 8 =
  26. 26.9 × 2 = 1? — what is the missing digit?
  27. 27.7 × 9 =
  28. 28.Magic square (every row, column and diagonal has the same total): ? 16 31 | 34 22 10 | 13 28 25. What is the missing number?
  29. 29.The ages of two twins add up to 14. How old is each twin?
  30. 30.Magic square (every row, column and diagonal has the same total): 13 27 17 | 23 19 15 | 21 ? 25. What is the missing number?
  31. 31.6 × 9 =
  32. 32.31 × 4 =
  33. 33.683 × 10 =
  34. 34.37 × 27 =
  35. 35.Odd one out: which number is NOT in the 3 times table? (a) 14 (b) 18 (c) 24 (d) 9
  36. 36.Take 44 and take away the sum of its digits. What do you get?
  37. 37.9 × 5 =
  38. 38.111111 × 111111 =
  39. 39.12345679 × 72 =
  40. 40.1 + 2 + 3 + … + 8 =

Answer key

  1. 21
  2. 4
  3. 16
  4. 3828
  5. 7
  6. 8
  7. 121
  8. 40
  9. 45
  10. 1089
  11. 18
  12. 29
  13. 100
  14. 12
  15. 72
  16. 5
  17. 10
  18. 224
  19. 45
  20. 10
  21. 27
  22. 630
  23. 2
  24. 70
  25. 72
  26. 8
  27. 63
  28. 19
  29. 7
  30. 11
  31. 54
  32. 124
  33. 6830
  34. 999
  35. 14
  36. 36
  37. 45
  38. 12345654321
  39. 888888888
  40. 36

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