Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 411 · 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. 1.11 × 10 =
2. 2.Half of 52 =
3. 3.Double 38 =
4. 4.9 × 1 =
5. 5.Magic square (every row, column and diagonal has the same total): 18 20 10 | 8 16 24 | 22 12 ?. What is the missing number?
6. 6.A girl is 6 years old and her brother is 3 years older. How old will her brother be in 3 years?
7. 7.What comes next? 20, 26, 32, 38, ? (a) 38 (b) 45 (c) 50 (d) 44
8. 8.12345679 × 36 =
9. 9.9 × 2 = ?8 — what is the missing digit?
10. 10.15 × ? = 15000
11. 11.9 × 3 =
12. 12.583 × 10 =
13. 13.The ages of two twins add up to 28. How old is each twin?
14. 14.9 × 10 = ?0 — what is the missing digit?
15. 15.111111 × 111111 =
16. 16.46 × 100 =
17. 17.123 × 9 + 4 =
18. 18.12 × ? = 12000
19. 19.Double 71 =
20. 20.4 × 9 =
21. 21.40 × 1000 =
22. 22.Double 41 =
23. 23.198 + 891 =
24. 24.6?50 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.I thought of a number, multiplied it by 5 and added 5. I got 30. What was my number?
26. 26.Half of 182 =
27. 27.?287 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.The ages of two twins add up to 26. How old is each twin?
29. 29.Take 994. Reverse its digits and take the smaller number away from the bigger one. What do you get?
30. 30.If today is Sunday, what day was it 11 days ago? (a) Tuesday (b) Wednesday (c) Thursday (d) Saturday
31. 31.Magic square (every row, column and diagonal has the same total): 13 23 21 | 27 19 11 | 17 ? 25. What is the missing number?
32. 32.1 + 2 + 3 + … + 98 =
33. 33.Magic square (every row, column and diagonal has the same total): 9 16 11 | 14 12 ? | 13 8 15. What is the missing number?
34. 34.A father is 45 years old and his son is 8. How old was the father when the son was born?
35. 35.If today is Wednesday, what day was it 35 days ago? (a) Thursday (b) Saturday (c) Tuesday (d) Wednesday
36. 36.Take 26 and take away the sum of its digits. What do you get?
37. 37.You have 11 coins. Each coin is ₹1 or ₹2, and together they make ₹17. How many ₹2 coins do you have?
38. 38.Double 87 =
39. 39.9 × 9 =
40. 40.792 + 297 =

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