A 2.5m strip of ribbon is 10mm wide. How many strips would be needed to cover 1m squared

We have two different measurement types here, mm (which stands for millimeter) and m (which stands for meter.)

We need these all in one type of measurement to solve this, so let's turn mm to m.

There are 100 milimeters in a meter.

This means that, in order to turn milimeters to meters, we need to take the amount of milimeters, and put it over 100.

We have 10 milimeters, so we have 10/100 meters. This is really 1/10 meters.

 

Now we know the dimensions of out strip of ribbon. It is 2.5m by 1/10m.

To find the area of this strip of ribbon, we multiply width times length, so

2.5m x 1/10m

2.5m x 0.1m

0.25m²

 

Now, how many of these ribbons do we need to cover 1m²? To figure this out, divide 1m² by 0.25m²

1m² ÷ 0.25m²

1m² ÷ 0.25m²

1 ÷ 0.25

4

 

So we need 4 of these strips to cover an area of 1m squared.