Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 244 · 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.Magic square (every row, column and diagonal has the same total): ? 23 20 | 29 17 5 | 14 11 26. What is the missing number?
2. 2.Magic square (every row, column and diagonal has the same total): 9 23 13 | ? 15 11 | 17 7 21. What is the missing number?
3. 3.84?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.14 × 4 =
5. 5.?39 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.68 × 100 =
7. 7.Magic square (every row, column and diagonal has the same total): 13 8 15 | 14 12 10 | 9 ? 11. What is the missing number?
8. 8.Magic square (every row, column and diagonal has the same total): 13 3 17 | 15 11 7 | ? 19 9. What is the missing number?
9. 9.What comes next? 5, 9, 13, 17, ? (a) 22 (b) 17 (c) 21 (d) 25
10. 10.1 + 2 + 3 + … + 71 =
11. 11.Take 94 and take away the sum of its digits. What do you get?
12. 12.37 × 4 =
13. 13.12345679 × 81 =
14. 14.1234 × 9 + 5 =
15. 15.The 1st of a month is a Thursday. What day is the 30th of the same month? (a) Monday (b) Friday (c) Thursday (d) Saturday
16. 16.32 × 1000 =
17. 17.If today is Monday, what day will it be after 92 days? (a) Friday (b) Wednesday (c) Monday (d) Tuesday
18. 18.12345679 × 45 =
19. 19.1 + 2 + 3 + … + 94 =
20. 20.9 × 2 =
21. 21.Think of 14. Multiply it by 2, then add 1. What number do you end with?
22. 22.1 + 3 + 5 + … + 41 =
23. 23.The 3rd of a month is a Sunday. What day is the 19th of the same month? (a) Wednesday (b) Tuesday (c) Friday (d) Monday
24. 24.44 × 4 =
25. 25.850 × ? = 8500
26. 26.1 + 2 + 3 + … + 12 =
27. 27.Odd one out: which number is NOT in the 7 times table? (a) 28 (b) 17 (c) 70 (d) 49
28. 28.Magic square (every row, column and diagonal has the same total): 8 13 6 | 7 9 11 | ? 5 10. What is the missing number?
29. 29.81 × 100 =
30. 30.In the 1089 trick, the subtraction gave a 3-digit number that starts with 2. What is that number?
31. 31.Magic square (every row, column and diagonal has the same total): 27 6 21 | 12 ? 24 | 15 30 9. What is the missing number?
32. 32.512 × ? = 5120
33. 33.If today is Monday, what day will it be after 41 days? (a) Wednesday (b) Sunday (c) Monday (d) Saturday
34. 34.49 × 4 =
35. 35.Take 41 and take away the sum of its digits. What do you get?
36. 36.Double 42 =
37. 37.Double 65 =
38. 38.What comes next? 2, 4, 8, 16, ? (a) 33 (b) 32 (c) 28 (d) 24
39. 39.A piggy bank has 7 coins of ₹5 and 2 coins of ₹2. How many rupees are in it?
40. 40.In 3 years a boy will be 12 years old. How old was he 2 years ago?

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