Answer:
1.2 meters
Explanation:
First we would need to know how many millimeters is in a meter.
1 Meter = 1000 millimeters
Now lets solve the problem.
If each piece of construction paper is 300 millimeters long, and there is 4 pieces of paper, then we can use an equation that looks like this:
300 × 4 = 1200
Now we can convert this into meters.
1200 ÷ 1000 = 1.2
His banner is 1.2 meters long.