Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 901 · 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. 1.12345678 × 9 + 9 =
2. 2.12345 × 8 + 5 =
3. 3.Think of 10. Multiply it by 3, then add 7. What number do you end with?
4. 4.What comes next? 4, 8, 16, 32, ? (a) 56 (b) 48 (c) 65 (d) 64
5. 5.Double 94 =
6. 6.29 × 4 =
7. 7.Double 91 =
8. 8.111 × 111 =
9. 9.Half of 178 =
10. 10.184 × ? = 1840
11. 11.Magic square (every row, column and diagonal has the same total): 26 ? 14 | 5 17 29 | 20 23 8. What is the missing number?
12. 12.37 × 6 =
13. 13.Take 60 and take away the sum of its digits. What do you get?
14. 14.9 × 3 = 2? — what is the missing digit?
15. 15.635 × 10 =
16. 16.You have 14 coins. Each coin is ₹1 or ₹2, and together they make ₹24. How many ₹2 coins do you have?
17. 17.9 × 4 = 3? — what is the missing digit?
18. 18.446? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.The ages of two twins add up to 8. How old is each twin?
20. 20.Half of 98 =
21. 21.879 × 10 =
22. 22.49 × 4 =
23. 23.I thought of a number, added 7 and then doubled it. I got 44. What was my number?
24. 24.Half of 42 =
25. 25.If today is Friday, what day was it 11 days ago? (a) Monday (b) Sunday (c) Tuesday (d) Thursday
26. 26.12345679 × 36 =
27. 27.60?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Magic square (every row, column and diagonal has the same total): 4 11 6 | 9 7 5 | 8 3 ?. What is the missing number?
29. 29.7 × 9 =
30. 30.9 × 9 =
31. 31.9 × 7 =
32. 32.Magic square (every row, column and diagonal has the same total): 15 8 ? | 10 12 14 | 11 16 9. What is the missing number?
33. 33.9 × 3 = ?7 — what is the missing digit?
34. 34.51 × 4 =
35. 35.The 3rd of a month is a Monday. What day is the 27th of the same month? (a) Friday (b) Thursday (c) Sunday (d) Wednesday
36. 36.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
37. 37.12345 × 9 + 6 =
38. 38.78 × 100 =
39. 39.39 × 4 =
40. 40.A girl is 9 years old and her brother is 6 years older. How old will her brother be in 4 years?

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