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Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 344 · 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. 1.25 × 4 =
  2. 2.1 + 2 + 3 + … + 60 =
  3. 3.35 × 1000 =
  4. 4.9 × 5 =
  5. 5.37 × 3 =
  6. 6.What comes next? 2, 4, 8, 16, ? (a) 24 (b) 33 (c) 28 (d) 32
  7. 7.37 × 6 =
  8. 8.164? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  9. 9.Magic square (every row, column and diagonal has the same total): 9 10 5 | 4 8 ? | 11 6 7. What is the missing number?
  10. 10.42 × 1000 =
  11. 11.Magic square (every row, column and diagonal has the same total): 7 21 11 | 17 13 ? | 15 5 19. What is the missing number?
  12. 12.11 × 4 =
  13. 13.A piggy bank has 7 coins of ₹5 and 13 coins of ₹2. How many rupees are in it?
  14. 14.Half of 14 =
  15. 15.What comes next? 16, 25, 36, 49, ? (a) 62 (b) 65 (c) 64 (d) 66
  16. 16.12345679 × 63 =
  17. 17.Magic trick! Think of 16. Double it, add 14, halve it, then take away 16. What number do you get?
  18. 18.Double 13 =
  19. 19.Odd one out: which number is NOT in the 4 times table? (a) 24 (b) 8 (c) 20 (d) 18
  20. 20.1 + 2 + 3 + … + 78 =
  21. 21.If today is Wednesday, what day was it 45 days ago? (a) Monday (b) Sunday (c) Wednesday (d) Saturday
  22. 22.The ages of two twins add up to 16. How old is each twin?
  23. 23.9 × 6 = ?4 — what is the missing digit?
  24. 24.Take 744. Reverse its digits and take the smaller number away from the bigger one. What do you get?
  25. 25.44 × 4 =
  26. 26.82 × 100 =
  27. 27.9 × 9 = 8? — what is the missing digit?
  28. 28.9 × 5 = ?5 — what is the missing digit?
  29. 29.Think of 9. Multiply it by 4, then add 2. What number do you end with?
  30. 30.A piggy bank has 12 coins of ₹5 and 7 coins of ₹2. How many rupees are in it?
  31. 31.30 × ? = 30000
  32. 32.1 + 2 + 3 + … + 77 =
  33. 33.Magic square (every row, column and diagonal has the same total): 7 12 ? | 6 8 10 | 11 4 9. What is the missing number?
  34. 34.34 × 4 =
  35. 35.Half of 18 =
  36. 36.984 × 10 =
  37. 37.1 + 2 + 3 + … + 11 =
  38. 38.Magic square (every row, column and diagonal has the same total): 20 17 32 | 35 ? 11 | 14 29 26. What is the missing number?
  39. 39.1?74 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
  40. 40.1 + 2 + 3 + … + 93 =

Answer key

  1. 100
  2. 1830
  3. 35000
  4. 45
  5. 111
  6. 32
  7. 222
  8. 7
  9. 12
  10. 42000
  11. 9
  12. 44
  13. 61
  14. 7
  15. 64
  16. 777777777
  17. 7
  18. 26
  19. 18
  20. 3081
  21. Sunday
  22. 8
  23. 5
  24. 297
  25. 176
  26. 8200
  27. 1
  28. 4
  29. 38
  30. 74
  31. 1000
  32. 3003
  33. 5
  34. 136
  35. 9
  36. 9840
  37. 66
  38. 23
  39. 6
  40. 4371

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