Digit Sum Magic Worksheet

Maths tricks trick 10: Digit-sum magic · Set 673 · 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 93 and take away the sum of its digits. What do you get?
2. 2.Take 47 and take away the sum of its digits. What do you get?
3. 3.Take 67 and take away the sum of its digits. What do you get?
4. 4.Take 13 and take away the sum of its digits. What do you get?
5. 5.7?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
6. 6.4?21 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
7. 7.1?12 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
8. 8.?72 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
9. 9.Take 62 and take away the sum of its digits. What do you get?
10. 10.Take 77 and take away the sum of its digits. What do you get?
11. 11.33?3 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
12. 12.?627 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.?872 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
15. 15.Take 64 and take away the sum of its digits. What do you get?
16. 16.377? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
17. 17.61? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
18. 18.Take 48 and take away the sum of its digits. What do you get?
19. 19.Take 44 and take away the sum of its digits. What do you get?
20. 20.Take 18 and take away the sum of its digits. What do you get?
21. 21.Take 86 and take away the sum of its digits. What do you get?
22. 22.?353 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
23. 23.?538 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
24. 24.Take 51 and take away the sum of its digits. What do you get?
25. 25.?031 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
26. 26.5?24 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
27. 27.8?36 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
28. 28.5?57 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
29. 29.?629 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
30. 30.85?9 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
31. 31.58?5 is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
32. 32.Take 98 and take away the sum of its digits. What do you get?
33. 33.Take 26 and take away the sum of its digits. What do you get?
34. 34.711? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
35. 35.Take 37 and take away the sum of its digits. What do you get?
36. 36.Take 78 and take away the sum of its digits. What do you get?
37. 37.Take 34 and take away the sum of its digits. What do you get?
38. 38.Take 89 and take away the sum of its digits. What do you get?
39. 39.868? is in the 9 times table. One digit is hidden, and it is not 0. What is the hidden digit?
40. 40.Take 80 and take away the sum of its digits. What do you get?

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