Maths Tricks Practice Worksheet

Maths tricks trick 15: Mixed trick challenge · Set 892 · 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.Half of 134 =
2. 2.6 × 4 =
3. 3.30 × 4 =
4. 4.I thought of a number, multiplied it by 5 and added 6. I got 71. What was my number?
5. 5.185 × 10 =
6. 6.11 × 11 =
7. 7.1 + 2 + 3 + … + 99 =
8. 8.12345679 × 72 =
9. 9.9 × 7 = ?3 — what is the missing digit?
10. 10.A girl is 5 years old and her brother is 2 years older. How old will her brother be in 6 years?
11. 11.9 × 6 = 5? — what is the missing digit?
12. 12.3 × 9 =
13. 13.4 × 9 =
14. 14.Magic square (every row, column and diagonal has the same total): 15 17 ? | 5 13 21 | 19 9 11. What is the missing number?
15. 15.Double 31 =
16. 16.I thought of a number, multiplied it by 5 and added 4. I got 39. What was my number?
17. 17.37 × 21 =
18. 18.I thought of a number, added 5 and then doubled it. I got 20. What was my number?
19. 19.Double 95 =
20. 20.6 × 9 =
21. 21.Do the 1089 trick with 580: reverse and subtract, then reverse that answer and add. What do you get?
22. 22.Double 87 =
23. 23.9 × 5 =
24. 24.Take 69 and take away the sum of its digits. What do you get?
25. 25.Double 52 =
26. 26.The 1st of a month is a Sunday. What day is the 13th of the same month? (a) Thursday (b) Saturday (c) Monday (d) Friday
27. 27.9 × 4 = ?6 — what is the missing digit?
28. 28.Take 930. Reverse its digits and take the smaller number away from the bigger one. What do you get?
29. 29.?013 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.18 × 4 =
31. 31.Take 77 and take away the sum of its digits. What do you get?
32. 32.In the 1089 trick, the subtraction gave a 3-digit number that starts with 5. What is that number?
33. 33.3?18 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.In the 1089 trick, the subtraction gave a 3-digit number that starts with 4. What is that number?
35. 35.A piggy bank has 8 coins of ₹5 and 15 coins of ₹2. How many rupees are in it?
36. 36.125 × ? = 1250
37. 37.12345679 × 18 =
38. 38.1 × 9 =
39. 39.What comes next? 4, 9, 16, 25, ? (a) 38 (b) 37 (c) 34 (d) 36
40. 40.In 2 years a boy will be 10 years old. How old was he 3 years ago?

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