Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 545 · 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.Double 38 =
2. 2.Magic trick! Think of 18. Double it, add 14, halve it, then take away 18. What number do you get?
3. 3.?001 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.Take 34 and take away the sum of its digits. What do you get?
5. 5.9 × 6 =
6. 6.What comes next? 25, 36, 49, 64, ? (a) 81 (b) 83 (c) 79 (d) 82
7. 7.12345679 × 45 =
8. 8.Half of 102 =
9. 9.1 + 3 + 5 + … + 9 =
10. 10.212 × 10 =
11. 11.What comes next? 14, 22, 30, 38, ? (a) 38 (b) 46 (c) 54 (d) 47
12. 12.1234567 × 8 + 7 =
13. 13.24 × 4 =
14. 14.9 × 6 = ?4 — what is the missing digit?
15. 15.1 + 2 + 3 + … + 72 =
16. 16.What comes next? 15, 18, 21, 24, ? (a) 27 (b) 24 (c) 30 (d) 28
17. 17.Double 74 =
18. 18.The 2nd of a month is a Sunday. What day is the 12th of the same month? (a) Thursday (b) Saturday (c) Wednesday (d) Tuesday
19. 19.Take 42 and take away the sum of its digits. What do you get?
20. 20.The 2nd of a month is a Tuesday. What day is the 22nd of the same month? (a) Sunday (b) Tuesday (c) Monday (d) Thursday
21. 21.30 × 4 =
22. 22.43 × 1000 =
23. 23.1 + 2 + 3 + … + 67 =
24. 24.Magic trick! Think of 14. Double it, add 14, halve it, then take away 14. What number do you get?
25. 25.In the 1089 trick, the subtraction gave a 3-digit number that starts with 8. What is that number?
26. 26.What comes next? 10, 13, 16, 19, ? (a) 25 (b) 19 (c) 23 (d) 22
27. 27.574 × 10 =
28. 28.1 + 2 + 3 + … + 15 =
29. 29.Odd one out: which number is NOT in the 8 times table? (a) 40 (b) 54 (c) 32 (d) 56
30. 30.Take 926. Reverse its digits and take the smaller number away from the bigger one. What do you get?
31. 31.1 + 3 + 5 + … + 35 =
32. 32.3?26 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
33. 33.A piggy bank has 7 coins of ₹5 and 5 coins of ₹2. How many rupees are in it?
34. 34.Think of 3. Multiply it by 2, then add 7. What number do you end with?
35. 35.In the 1089 trick, the subtraction gave a 3-digit number that starts with 6. What is that number?
36. 36.Double 79 =
37. 37.2 × 9 =
38. 38.Magic square (every row, column and diagonal has the same total): 8 7 12 | 13 9 5 | 6 11 ?. What is the missing number?
39. 39.1 + 3 + 5 + … + 21 =
40. 40.Take 47 and take away the sum of its digits. What do you get?

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