Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 797 · 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. 1.46 × 1000 =
2. 2.I thought of a number, added 2 and then doubled it. I got 10. What was my number?
3. 3.Half of 104 =
4. 4.87 × 100 =
5. 5.9 × 5 =
6. 6.Double 71 =
7. 7.If today is Wednesday, what day was it 42 days ago? (a) Thursday (b) Wednesday (c) Saturday (d) Tuesday
8. 8.1 + 3 + 5 + … + 45 =
9. 9.Magic square (every row, column and diagonal has the same total): 10 15 8 | 9 11 ? | 14 7 12. What is the missing number?
10. 10.I thought of a number, multiplied it by 4 and added 5. I got 65. What was my number?
11. 11.4 × 1000 =
12. 12.12345679 × 72 =
13. 13.Magic trick! Think of 3. Double it, add 14, halve it, then take away 3. What number do you get?
14. 14.Think of 4. Multiply it by 2, then add 8. What number do you end with?
15. 15.What comes next? 1, 4, 9, 16, ? (a) 27 (b) 25 (c) 26 (d) 23
16. 16.Magic trick! Think of 6. Double it, add 10, halve it, then take away 6. What number do you get?
17. 17.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹11. How many ₹2 coins do you have?
18. 18.Double 85 =
19. 19.906 × 10 =
20. 20.9 × 9 =
21. 21.1 + 3 + 5 + … + 21 =
22. 22.The 5th of a month is a Thursday. What day is the 14th of the same month? (a) Sunday (b) Saturday (c) Tuesday (d) Friday
23. 23.Magic square (every row, column and diagonal has the same total): 12 27 6 | 9 15 21 | ? 3 18. What is the missing number?
24. 24.Magic square (every row, column and diagonal has the same total): 19 34 13 | ? 22 28 | 31 10 25. What is the missing number?
25. 25.1 + 3 + 5 + … + 13 =
26. 26.9 × 5 = 4? — what is the missing digit?
27. 27.35 × 1000 =
28. 28.Double 49 =
29. 29.I thought of a number, added 2 and then doubled it. I got 42. What was my number?
30. 30.3 × 9 =
31. 31.Do the 1089 trick with 903: reverse and subtract, then reverse that answer and add. What do you get?
32. 32.1 + 3 + 5 + … + 11 =
33. 33.The 5th of a month is a Wednesday. What day is the 23rd of the same month? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
34. 34.8 × 9 =
35. 35.Half of 62 =
36. 36.Odd one out: which number is NOT in the 8 times table? (a) 19 (b) 56 (c) 16 (d) 40
37. 37.51 × ? = 5100
38. 38.What comes next? 19, 22, 25, 28, ? (a) 28 (b) 31 (c) 32 (d) 34
39. 39.Half of 186 =
40. 40.6?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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