Question

use compatible numbers to do this mentally!
(+0.43) + (-1.8) + (+0.57) + (-0.2)

Answer 1

hows it 0

Answer 2

ok but what are the compatible numbers

Answer 3

haha whoops! -1! i'm sorry, -1.8 + (-0.2) = -2

Answer 4

it says make them compatible numbers first

Answer 5

the answer is -1. -1.8 + (-0.2) = -2 and 0.43 + 0.57 = 1, so -2 + 1 = -1. compatible numbers means numbers that fit together, which is why i arranged the equations the way i did.