Question

Tell how to use compatible numbers to compute each of the following.

(a) 125 + 3 + 40 + 37 + 75 + 60

(b) 4 • 4 • 50 • 25

Answer 1

I would pick 125 + 40 + 40 + 75 + 60. The actual numbers you choose depends somewhat upon how well you add. Here is what I would do.
I would add the 125 to the 75 = 200.
Then I would add 60 + 40 = 100
Of course 37 + 3 = 40
So it should be 200 + 100 + 40 = 340