Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 453 · 40 questions

The trick (Digits add to the 9 table): Add the digits you can see. Find the next number in the 9 table (9, 18, 27 …) above that total. The hidden digit is the difference. (Any number minus its digit sum is in the 9 table too.)

1. 1.Take 46 and take away the sum of its digits. What do you get?
2. 2.63?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
3. 3.?622 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
4. 4.?559 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.Take 93 and take away the sum of its digits. What do you get?
6. 6.Take 43 and take away the sum of its digits. What do you get?
7. 7.457? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.Take 79 and take away the sum of its digits. What do you get?
9. 9.5?24 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
10. 10.484? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
11. 11.Take 54 and take away the sum of its digits. What do you get?
12. 12.?464 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
13. 13.Take 38 and take away the sum of its digits. What do you get?
14. 14.Take 33 and take away the sum of its digits. What do you get?
15. 15.?668 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
16. 16.741? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.21? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.?555 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.Take 39 and take away the sum of its digits. What do you get?
20. 20.666? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
21. 21.Take 51 and take away the sum of its digits. What do you get?
22. 22.6?04 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.Take 11 and take away the sum of its digits. What do you get?
24. 24.?536 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.45?4 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.?709 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.Take 91 and take away the sum of its digits. What do you get?
28. 28.Take 27 and take away the sum of its digits. What do you get?
29. 29.2?86 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.Take 30 and take away the sum of its digits. What do you get?
31. 31.Take 24 and take away the sum of its digits. What do you get?
32. 32.Take 48 and take away the sum of its digits. What do you get?
33. 33.Take 37 and take away the sum of its digits. What do you get?
34. 34.676? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.3?45 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.33? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.Take 29 and take away the sum of its digits. What do you get?
38. 38.87?0 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 85 and take away the sum of its digits. What do you get?
40. 40.?581 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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