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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 592 · 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. 1.1 + 3 + 5 + … + 29 =
  2. 2.37 × 18 =
  3. 3.What comes next? 3, 6, 12, 24, ? (a) 36 (b) 42 (c) 49 (d) 48
  4. 4.9 × 5 =
  5. 5.602? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  6. 6.25 × ? = 2500
  7. 7.9 × 10 =
  8. 8.A girl is 8 years old and her brother is 5 years older. How old will her brother be in 4 years?
  9. 9.67?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  10. 10.44 × 4 =
  11. 11.If today is Tuesday, what day will it be after 76 days? (a) Tuesday (b) Sunday (c) Monday (d) Thursday
  12. 12.Odd one out: which number is NOT in the 8 times table? (a) 47 (b) 16 (c) 32 (d) 24
  13. 13.9 × 3 =
  14. 14.1 + 3 + 5 + … + 27 =
  15. 15.Magic square (every row, column and diagonal has the same total): 14 4 18 | 16 ? 8 | 6 20 10. What is the missing number?
  16. 16.Half of 98 =
  17. 17.9 × 4 =
  18. 18.Double 63 =
  19. 19.1 × 9 =
  20. 20.Do the 1089 trick with 319: reverse and subtract, then reverse that answer and add. What do you get?
  21. 21.37 × 21 =
  22. 22.What comes next? 4, 13, 22, 31, ? (a) 49 (b) 41 (c) 31 (d) 40
  23. 23.41 × 4 =
  24. 24.37 × 6 =
  25. 25.9 × 4 = 3? — what is the missing digit?
  26. 26.Half of 52 =
  27. 27.I thought of a number, added 3 and then doubled it. I got 34. What was my number?
  28. 28.Magic square (every row, column and diagonal has the same total): ? 24 14 | 20 16 12 | 18 8 22. What is the missing number?
  29. 29.?449 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  30. 30.Magic square (every row, column and diagonal has the same total): 16 6 8 | 2 10 18 | 12 14 ?. What is the missing number?
  31. 31.Double 46 =
  32. 32.53 × ? = 5300
  33. 33.45 × 4 =
  34. 34.111111 × 111111 =
  35. 35.Take 13 and take away the sum of its digits. What do you get?
  36. 36.Take 38 and take away the sum of its digits. What do you get?
  37. 37.You have 7 coins. Each coin is ₹1 or ₹2, and together they make ₹10. How many ₹2 coins do you have?
  38. 38.Double 21 =
  39. 39.1 + 2 + 3 + … + 48 =
  40. 40.94 × 100 =

Answer key

  1. 225
  2. 666
  3. 48
  4. 45
  5. 1
  6. 100
  7. 90
  8. 17
  9. 8
  10. 176
  11. Monday
  12. 47
  13. 27
  14. 196
  15. 12
  16. 49
  17. 36
  18. 126
  19. 9
  20. 1089
  21. 777
  22. 40
  23. 164
  24. 222
  25. 6
  26. 26
  27. 14
  28. 10
  29. 1
  30. 4
  31. 92
  32. 100
  33. 180
  34. 12345654321
  35. 9
  36. 27
  37. 3
  38. 42
  39. 1176
  40. 9400

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