Calculate all of the following
1. 12+28-15
2. 33-12+17
3. 77-33-25
4. 66+21-44
5. 75-49+22
6. 128-49-31
7. 256+123-277
8. 421-123+85
9. 333-118-108
10. 327-45-123
happy trying!
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