Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 392 · 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. 1.12 × 9 + 3 =
2. 2.1234567 × 8 + 7 =
3. 3.Magic square (every row, column and diagonal has the same total): 23 26 11 | 8 20 ? | 29 14 17. What is the missing number?
4. 4.9 × 10 =
5. 5.Magic square (every row, column and diagonal has the same total): 14 29 26 | 35 23 11 | 20 17 ?. What is the missing number?
6. 6.Magic square (every row, column and diagonal has the same total): 4 9 8 | ? 7 3 | 6 5 10. What is the missing number?
7. 7.37 × 27 =
8. 8.Magic square (every row, column and diagonal has the same total): ? 18 13 | 16 14 12 | 15 10 17. What is the missing number?
9. 9.I thought of a number, added 5 and then doubled it. I got 24. What was my number?
10. 10.1 + 2 + 3 + … + 23 =
11. 11.A girl is 7 years old and her brother is 6 years older. How old will her brother be in 2 years?
12. 12.Take 91 and take away the sum of its digits. What do you get?
13. 13.16 × 1000 =
14. 14.11111 × 11111 =
15. 15.The 3rd of a month is a Thursday. What day is the 15th of the same month? (a) Monday (b) Friday (c) Wednesday (d) Tuesday
16. 16.The ages of two twins add up to 28. How old is each twin?
17. 17.11 × 11 =
18. 18.53 × 4 =
19. 19.2 × 1000 =
20. 20.11 × 4 =
21. 21.Double 86 =
22. 22.1?47 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.What comes next? 5, 10, 20, 40, ? (a) 60 (b) 70 (c) 80 (d) 81
24. 24.What comes next? 17, 26, 35, 44, ? (a) 62 (b) 44 (c) 53 (d) 54
25. 25.36 × 4 =
26. 26.12345679 × 54 =
27. 27.38 × 4 =
28. 28.Double 37 =
29. 29.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹23. How many ₹2 coins do you have?
30. 30.2 × 9 =
31. 31.5 × ? = 5000
32. 32.The 2nd of a month is a Friday. What day is the 20th of the same month? (a) Friday (b) Wednesday (c) Monday (d) Tuesday
33. 33.9 × 3 =
34. 34.1 + 3 + 5 + … + 27 =
35. 35.1 + 2 + 3 + … + 21 =
36. 36.What comes next? 5, 10, 15, 20, ? (a) 20 (b) 25 (c) 26 (d) 30
37. 37.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
38. 38.14 × 4 =
39. 39.28 × 1000 =
40. 40.If today is Wednesday, what day will it be after 96 days? (a) Tuesday (b) Sunday (c) Monday (d) Thursday

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