Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 316 · 40 questions

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.

1. 1.Half of 42 =
2. 2.What comes next? 8, 10, 12, 14, ? (a) 18 (b) 17 (c) 16 (d) 14
3. 3.13 × 1000 =
4. 4.Take 451. Reverse its digits and take the smaller number away from the bigger one. What do you get?
5. 5.Half of 112 =
6. 6.A father is 42 years old and his son is 6. How old was the father when the son was born?
7. 7.792 + 297 =
8. 8.?479 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.Magic trick! Think of 18. Double it, add 12, halve it, then take away 18. What number do you get?
10. 10.Double 55 =
11. 11.A piggy bank has 3 coins of ₹5 and 4 coins of ₹2. How many rupees are in it?
12. 12.?497 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.Magic square (every row, column and diagonal has the same total): 8 22 12 | 18 14 ? | 16 6 20. What is the missing number?
14. 14.9 × 2 = ?8 — what is the missing digit?
15. 15.15 × 4 =
16. 16.9 × 4 =
17. 17.Think of 7. Multiply it by 3, then add 8. What number do you end with?
18. 18.Take 71 and take away the sum of its digits. What do you get?
19. 19.41 × 1000 =
20. 20.123 × 9 + 4 =
21. 21.Magic square (every row, column and diagonal has the same total): 13 ? 19 | 28 22 16 | 25 10 31. What is the missing number?
22. 22.Half of 184 =
23. 23.11 × 11 =
24. 24.Take 14 and take away the sum of its digits. What do you get?
25. 25.44 × 4 =
26. 26.Odd one out: which number is NOT in the 5 times table? (a) 20 (b) 44 (c) 15 (d) 30
27. 27.52?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.9 × 10 =
29. 29.Magic trick! Think of 18. Double it, add 10, halve it, then take away 18. What number do you get?
30. 30.1 + 3 + 5 + … + 39 =
31. 31.9 × 2 = 1? — what is the missing digit?
32. 32.43 × 1000 =
33. 33.Odd one out: which number is NOT in the 4 times table? (a) 9 (b) 8 (c) 28 (d) 16
34. 34.I thought of a number, added 6 and then doubled it. I got 20. What was my number?
35. 35.If today is Monday, what day was it 38 days ago? (a) Thursday (b) Monday (c) Friday (d) Saturday
36. 36.Take 169. Reverse its digits and take the smaller number away from the bigger one. What do you get?
37. 37.A girl is 10 years old and her brother is 3 years older. How old will her brother be in 8 years?
38. 38.9 × 3 =
39. 39.12345679 × 72 =
40. 40.12345 × 9 + 6 =

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