Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 377 · 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. 1.1 + 2 + 3 + … + 87 =
2. 2.Think of 13. Multiply it by 2, then add 2. What number do you end with?
3. 3.37 × 3 =
4. 4.Double 35 =
5. 5.43 × 100 =
6. 6.Do the 1089 trick with 850: reverse and subtract, then reverse that answer and add. What do you get?
7. 7.1 + 2 + 3 + … + 17 =
8. 8.9 × 9 =
9. 9.A father is 30 years old and his son is 12. How old was the father when the son was born?
10. 10.Magic square (every row, column and diagonal has the same total): 15 12 27 | 30 ? 6 | 9 24 21. What is the missing number?
11. 11.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
12. 12.753 × 10 =
13. 13.Odd one out: which number is NOT in the 6 times table? (a) 30 (b) 12 (c) 59 (d) 42
14. 14.Double 34 =
15. 15.Magic square (every row, column and diagonal has the same total): 20 10 12 | 6 ? 22 | 16 18 8. What is the missing number?
16. 16.27 × 4 =
17. 17.178 × 10 =
18. 18.9 × 5 = ?5 — what is the missing digit?
19. 19.13 × 4 =
20. 20.12345679 × 9 =
21. 21.Double 17 =
22. 22.Magic square (every row, column and diagonal has the same total): ? 6 16 | 18 10 2 | 4 14 12. What is the missing number?
23. 23.Half of 32 =
24. 24.A piggy bank has 12 coins of ₹5 and 2 coins of ₹2. How many rupees are in it?
25. 25.23 × 4 =
26. 26.9 × 8 = 7? — what is the missing digit?
27. 27.A girl is 10 years old and her brother is 3 years older. How old will her brother be in 5 years?
28. 28.9 × 4 =
29. 29.Magic trick! Think of 7. Double it, add 12, halve it, then take away 7. What number do you get?
30. 30.6 × 9 =
31. 31.1 × 9 =
32. 32.What comes next? 4, 9, 16, 25, ? (a) 34 (b) 36 (c) 38 (d) 37
33. 33.Magic square (every row, column and diagonal has the same total): 3 8 7 | ? 6 2 | 5 4 9. What is the missing number?
34. 34.What comes next? 16, 25, 36, 49, ? (a) 65 (b) 64 (c) 66 (d) 62
35. 35.39 × 100 =
36. 36.If today is Friday, what day will it be after 49 days? (a) Friday (b) Saturday (c) Monday (d) Thursday
37. 37.Magic square (every row, column and diagonal has the same total): 11 ? 15 | 18 14 10 | 13 12 17. What is the missing number?
38. 38.51 × ? = 5100
39. 39.A father is 30 years old and his son is 7. How old was the father when the son was born?
40. 40.9 × 5 =

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