Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 670 · 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. 1.52 × 4 =
2. 2.89?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.58 × 4 =
4. 4.1 + 3 + 5 + … + 19 =
5. 5.What comes next? 16, 22, 28, 34, ? (a) 40 (b) 34 (c) 41 (d) 46
6. 6.85 × 100 =
7. 7.In 5 years a boy will be 17 years old. How old was he 3 years ago?
8. 8.1 + 2 + 3 + … + 49 =
9. 9.A father is 40 years old and his son is 11. How old was the father when the son was born?
10. 10.Magic square (every row, column and diagonal has the same total): 23 9 19 | 13 17 ? | 15 25 11. What is the missing number?
11. 11.Magic square (every row, column and diagonal has the same total): 10 ? 14 | 20 16 12 | 18 8 22. What is the missing number?
12. 12.Odd one out: which number is NOT in the 3 times table? (a) 9 (b) 26 (c) 18 (d) 6
13. 13.9 × 2 = 1? — what is the missing digit?
14. 14.I thought of a number, multiplied it by 4 and added 1. I got 21. What was my number?
15. 15.Take 240. Reverse its digits and take the smaller number away from the bigger one. What do you get?
16. 16.What comes next? 4, 9, 16, 25, ? (a) 36 (b) 34 (c) 37 (d) 38
17. 17.Do the 1089 trick with 880: reverse and subtract, then reverse that answer and add. What do you get?
18. 18.I thought of a number, added 1 and then doubled it. I got 38. What was my number?
19. 19.930 × 10 =
20. 20.Magic square (every row, column and diagonal has the same total): 18 33 ? | 15 21 27 | 30 9 24. What is the missing number?
21. 21.?13 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
23. 23.Think of 6. Multiply it by 3, then add 5. What number do you end with?
24. 24.If today is Thursday, what day will it be after 15 days? (a) Monday (b) Thursday (c) Friday (d) Saturday
25. 25.18 × 100 =
26. 26.1 + 3 + 5 + … + 15 =
27. 27.Half of 22 =
28. 28.9 × 8 = 7? — what is the missing digit?
29. 29.41 × ? = 4100
30. 30.Magic square (every row, column and diagonal has the same total): 31 10 25 | 16 22 ? | 19 34 13. What is the missing number?
31. 31.24 × 4 =
32. 32.Take 98 and take away the sum of its digits. What do you get?
33. 33.1 + 2 + 3 + … + 35 =
34. 34.You have 9 coins. Each coin is ₹1 or ₹2, and together they make ₹10. How many ₹2 coins do you have?
35. 35.In the 1089 trick, the subtraction gave a 3-digit number that starts with 1. What is that number?
36. 36.9 × 5 = 4? — what is the missing digit?
37. 37.If today is Saturday, what day was it 48 days ago? (a) Monday (b) Saturday (c) Sunday (d) Wednesday
38. 38.If today is Monday, what day will it be after 15 days? (a) Tuesday (b) Monday (c) Wednesday (d) Friday
39. 39.16 × 100 =
40. 40.33 × 4 =

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