Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 436 · 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. 1.70?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
2. 2.Take 16 and take away the sum of its digits. What do you get?
3. 3.Take 53 and take away the sum of its digits. What do you get?
4. 4.37?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
5. 5.189? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.610? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.Take 19 and take away the sum of its digits. What do you get?
8. 8.Take 40 and take away the sum of its digits. What do you get?
9. 9.Take 37 and take away the sum of its digits. What do you get?
10. 10.Take 69 and take away the sum of its digits. What do you get?
11. 11.Take 77 and take away the sum of its digits. What do you get?
12. 12.Take 94 and take away the sum of its digits. What do you get?
13. 13.Take 52 and take away the sum of its digits. What do you get?
14. 14.5?46 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 80 and take away the sum of its digits. What do you get?
16. 16.?84 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.476? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.16?6 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
19. 19.849? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
20. 20.Take 24 and take away the sum of its digits. What do you get?
21. 21.826? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
22. 22.Take 26 and take away the sum of its digits. What do you get?
23. 23.3?96 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.6?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
25. 25.Take 90 and take away the sum of its digits. What do you get?
26. 26.Take 22 and take away the sum of its digits. What do you get?
27. 27.?412 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.Take 88 and take away the sum of its digits. What do you get?
29. 29.Take 47 and take away the sum of its digits. What do you get?
30. 30.?78 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.Take 28 and take away the sum of its digits. What do you get?
32. 32.Take 61 and take away the sum of its digits. What do you get?
33. 33.?845 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
34. 34.4?55 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.?223 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
36. 36.?939 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
37. 37.40?8 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
38. 38.?799 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
39. 39.Take 99 and take away the sum of its digits. What do you get?
40. 40.23? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?

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