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?

Yes, there's plenty of border to go around, and here's why:

Firstly, we want to be using the same unit of measurement - not both dm's and cm's - so let's convert those dm measurements into cm by multiplying by 10.

You get a height of 50 and a width of 70. So the square will have two sides of 50cm, and two sides of 70cm:

We can add that together to get the perimeter or border length:

50+50+70+70= 240cm

So 240cm is how much we need.

We're told Mr. Okutani has 2 packages containing 125cm of border (so 2x125 = 250)

And since 250cm is greater than 240cm, it looks like Mr. Okutani will even have border to spare!