Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 857 · 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.The 6th of a month is a Wednesday. What day is the 14th of the same month? (a) Sunday (b) Thursday (c) Friday (d) Wednesday
2. 2.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
3. 3.Do the 1089 trick with 522: reverse and subtract, then reverse that answer and add. What do you get?
4. 4.If today is Tuesday, what day will it be after 79 days? (a) Thursday (b) Friday (c) Sunday (d) Wednesday
5. 5.327 × 10 =
6. 6.1 + 2 + 3 + … + 14 =
7. 7.A piggy bank has 2 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
8. 8.9 × 2 = 1? — what is the missing digit?
9. 9.Think of 4. Multiply it by 5, then add 9. What number do you end with?
10. 10.399 × 10 =
11. 11.Take 99 and take away the sum of its digits. What do you get?
12. 12.37 × 100 =
13. 13.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 26 (c) 27 (d) 25
14. 14.9 × 6 = ?4 — what is the missing digit?
15. 15.432 × 10 =
16. 16.Half of 62 =
17. 17.Double 87 =
18. 18.Half of 56 =
19. 19.Magic square (every row, column and diagonal has the same total): 10 5 12 | 11 ? 7 | 6 13 8. What is the missing number?
20. 20.Think of 11. Multiply it by 3, then add 6. What number do you end with?
21. 21.5 × 9 =
22. 22.A girl is 5 years old and her brother is 6 years older. How old will her brother be in 6 years?
23. 23.A girl is 8 years old and her brother is 3 years older. How old will her brother be in 8 years?
24. 24.1 + 2 + 3 + … + 71 =
25. 25.1 × 9 =
26. 26.Magic square (every row, column and diagonal has the same total): 9 30 15 | 24 18 12 | ? 6 27. What is the missing number?
27. 27.1 + 2 + 3 + … + 73 =
28. 28.6 × 9 =
29. 29.The ages of two twins add up to 16. How old is each twin?
30. 30.If today is Tuesday, what day will it be after 24 days? (a) Monday (b) Saturday (c) Friday (d) Thursday
31. 31.9 × 10 = ?0 — what is the missing digit?
32. 32.8 × 9 =
33. 33.27 × ? = 27000
34. 34.1 + 3 + 5 + … + 43 =
35. 35.61 × 100 =
36. 36.Double 61 =
37. 37.47 × 4 =
38. 38.Magic square (every row, column and diagonal has the same total): ? 24 9 | 6 18 30 | 27 12 15. What is the missing number?
39. 39.18 × 4 =
40. 40.35 × 4 =

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