Answer:
335, 517, 448
Step-by-step explanation:
set it up in a row
33_
5_7
+ _48
______
1300
look at the last column (add 7 +8) that give you 15. the last column is 0 you need to add 5 therefore the top blank is 5. don't forget to carry your 2
middle column is 2 (from carrying over) +3 +? plus 4...equals 9 you need it to equal 0 so add 1 (carry 1 over)
first column add 1 from carrying over +3 +5 +? =13 1+3+5=9 therefore you need 4 more to get 13.
