USE MENTAL MATH TO ADD OR SUBSTRACT:

Question

1. 80+79+20
2. 308+95+5
3. 480+255+20
4.365+289
5. 523-198
6. 537+180
7. 325+239+75
8. 87+38+62
9. 4500-280

Answer 1

1. 179
2. 408
3. 755
4. 654
5. 325
6. 710
7. 639
8. 187
9. 4220