Sorry I don't know what the options are but for me the answers were:
320 and 425
412 and 279
Explanation
So I have round the sum of the numbers to 700
320+425=745
rounded to the nearest hundred is 700
412+279=691
rounded to the nearest hundred is 700
tip: when rounding if a number is 4 or under round down but if it's 5 of higher round up.