Estimate. Find the sum 524+256

Put the 2 numbers in to a colom then start to add the two numbers right to left so 6+4 makes 10 then 5+2 + the 1 you carryed over to make 8 then add 5 and 2 to get 7 then add 10,8,7 to get 780

Step-by-step explanation:

▶ Sum of - 524 and 678

= - 524 + 678

= 154

▶ Now, difference of 154 and - 19

= 154 - (-19)

= 154 + 19

= 173