Question

Mr. Okutani is decorating a bulletin board that is 5 dm high and 7 dm wide. He has 2 packages of border that each contain 125 cm of border. does he have enough border to go all around the outside of the bulletin board?

Answer 1

Since you only have dm, and not dam or dkm, I will assume that you mean decimeter.
1 decimeter is 10 centimeters.
The perimeter is 24.
That becomes 240 cm.
He has 2 x 125 cm.
He has 250 cm of border.
250>240.
He has enough of border to go all around.