Estimate then find the sum or difference 8.5+1.8

Estimating usually means rounding to the nearest whole number to make it so that you can do the math in your head.
So, 8.5 becomes 9, and 1.8 becomes 2.
The sum would then be 11
And the difference is 7

A= b/2 because u simplying both sides of equation

put like terms together.orremember that the 45 becomes negative when moved to the other side.orthe minuses cancel out.