Answer:
680
Step-by-step explanation:
125 + 215 = 340
340+340 = 680
The 8 in position 4 (from the left) means 800 and the 5th 8 means 80
so position 4 8 is ten times the the next 8. - as you would expect because its the decimal system based on 10.
difference = 800-80 = 720.
When rounding earlier, it could be screwing you out of an extra few cents that you might eventually need for tax
