Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 839 · 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. 1.315 × 10 =
2. 2.1 + 2 + 3 + … + 66 =
3. 3.3 × 9 =
4. 4.1 + 2 + 3 + … + 57 =
5. 5.594 + 495 =
6. 6.If today is Saturday, what day was it 45 days ago? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
7. 7.11 × 4 =
8. 8.I thought of a number, multiplied it by 4 and added 8. I got 40. What was my number?
9. 9.Magic square (every row, column and diagonal has the same total): 21 11 25 | ? 19 15 | 13 27 17. What is the missing number?
10. 10.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 28 (c) 24 (d) 32
11. 11.Magic square (every row, column and diagonal has the same total): 13 15 5 | 3 11 19 | 17 7 ?. What is the missing number?
12. 12.7 × 4 =
13. 13.Double 87 =
14. 14.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
15. 15.9 × 3 = ?7 — what is the missing digit?
16. 16.A girl is 8 years old and her brother is 2 years older. How old will her brother be in 5 years?
17. 17.I thought of a number, added 6 and then doubled it. I got 22. What was my number?
18. 18.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹15. How many ₹2 coins do you have?
19. 19.1 + 2 + 3 + … + 100 =
20. 20.Double 88 =
21. 21.What comes next? 5, 10, 20, 40, ? (a) 80 (b) 81 (c) 60 (d) 70
22. 22.9 × 9 = 8? — what is the missing digit?
23. 23.Half of 196 =
24. 24.I thought of a number, multiplied it by 2 and added 1. I got 31. What was my number?
25. 25.Magic square (every row, column and diagonal has the same total): 9 14 7 | 8 10 12 | 13 6 ?. What is the missing number?
26. 26.Magic square (every row, column and diagonal has the same total): ? 22 12 | 18 14 10 | 16 6 20. What is the missing number?
27. 27.1 + 2 + 3 + … + 89 =
28. 28.2 × 9 =
29. 29.?463 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.1 + 2 + 3 + … + 56 =
31. 31.297 + 792 =
32. 32.28 × 10 =
33. 33.12345679 × 81 =
34. 34.A father is 41 years old and his son is 11. How old was the father when the son was born?
35. 35.49 × 4 =
36. 36.A father is 42 years old and his son is 4. How old was the father when the son was born?
37. 37.3 × ? = 300
38. 38.Take 37 and take away the sum of its digits. What do you get?
39. 39.Take 890. Reverse its digits and take the smaller number away from the bigger one. What do you get?
40. 40.If today is Tuesday, what day was it 32 days ago? (a) Friday (b) Monday (c) Thursday (d) Saturday

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