Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 813 · 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.Do the 1089 trick with 700: reverse and subtract, then reverse that answer and add. What do you get?
2. 2.Think of 9. Multiply it by 3, then add 1. What number do you end with?
3. 3.6 × 4 =
4. 4.13 × ? = 13000
5. 5.58 × 4 =
6. 6.9 × 10 = ?0 — what is the missing digit?
7. 7.Take 31 and take away the sum of its digits. What do you get?
8. 8.Double 78 =
9. 9.Do the 1089 trick with 620: reverse and subtract, then reverse that answer and add. What do you get?
10. 10.89? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.The 4th of a month is a Monday. What day is the 19th of the same month? (a) Friday (b) Wednesday (c) Tuesday (d) Monday
12. 12.Do the 1089 trick with 920: reverse and subtract, then reverse that answer and add. What do you get?
13. 13.12345679 × 45 =
14. 14.37 × 18 =
15. 15.13 × 4 =
16. 16.Take 93 and take away the sum of its digits. What do you get?
17. 17.Half of 182 =
18. 18.12345679 × 81 =
19. 19.3 × 9 =
20. 20.1 + 2 + 3 + … + 74 =
21. 21.43 × 4 =
22. 22.9 × 4 =
23. 23.What comes next? 36, 49, 64, 81, ? (a) 98 (b) 102 (c) 100 (d) 101
24. 24.63 × 100 =
25. 25.Double 15 =
26. 26.25 × 1000 =
27. 27.398 × 10 =
28. 28.Take 940. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.In 6 years a boy will be 16 years old. How old was he 6 years ago?
30. 30.A piggy bank has 7 coins of ₹5 and 9 coins of ₹2. How many rupees are in it?
31. 31.Magic square (every row, column and diagonal has the same total): 4 18 8 | 14 ? 6 | 12 2 16. What is the missing number?
32. 32.9 × 3 = ?7 — what is the missing digit?
33. 33.2 × 9 =
34. 34.953 × 10 =
35. 35.19 × 4 =
36. 36.You have 12 coins. Each coin is ₹1 or ₹2, and together they make ₹22. How many ₹2 coins do you have?
37. 37.9 × 7 =
38. 38.9 × 5 = ?5 — what is the missing digit?
39. 39.10 × 9 =
40. 40.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?

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