Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 779 · 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 + … + 66 =
2. 2.What comes next? 1, 2, 4, 8, ? (a) 14 (b) 12 (c) 16 (d) 17
3. 3.123456789 × 8 + 9 =
4. 4.49?1 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.12 × 8 + 2 =
6. 6.9 × 9 = ?1 — what is the missing digit?
7. 7.111111 × 111111 =
8. 8.A father is 44 years old and his son is 14. How old was the father when the son was born?
9. 9.You have 13 coins. Each coin is ₹1 or ₹2, and together they make ₹19. How many ₹2 coins do you have?
10. 10.9 × 2 =
11. 11.The 1st of a month is a Tuesday. What day is the 28th of the same month? (a) Sunday (b) Tuesday (c) Thursday (d) Monday
12. 12.12345679 × 45 =
13. 13.Magic trick! Think of 11. Double it, add 4, halve it, then take away 11. What number do you get?
14. 14.A girl is 8 years old and her brother is 4 years older. How old will her brother be in 6 years?
15. 15.Take 28 and take away the sum of its digits. What do you get?
16. 16.If today is Thursday, what day will it be after 69 days? (a) Wednesday (b) Tuesday (c) Thursday (d) Saturday
17. 17.Magic square (every row, column and diagonal has the same total): 22 8 18 | 12 16 20 | ? 24 10. What is the missing number?
18. 18.9 × 5 =
19. 19.47 × 4 =
20. 20.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
21. 21.Half of 74 =
22. 22.Double 51 =
23. 23.Half of 172 =
24. 24.38 × 1000 =
25. 25.Double 38 =
26. 26.Magic square (every row, column and diagonal has the same total): 7 17 15 | ? 13 5 | 11 9 19. What is the missing number?
27. 27.Take 577. Reverse its digits and take the smaller number away from the bigger one. What do you get?
28. 28.Half of 62 =
29. 29.The ages of two twins add up to 8. How old is each twin?
30. 30.17 × 1000 =
31. 31.74?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.58 × 4 =
33. 33.What comes next? 1, 4, 9, 16, ? (a) 23 (b) 26 (c) 27 (d) 25
34. 34.49 × 4 =
35. 35.Take 20 and take away the sum of its digits. What do you get?
36. 36.Double 92 =
37. 37.Double 15 =
38. 38.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
39. 39.1234567 × 9 + 8 =
40. 40.If today is Tuesday, what day will it be after 43 days? (a) Saturday (b) Wednesday (c) Thursday (d) Tuesday

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