4. Amy had 1 meter of ribbon. She wants to make five banners that each
require 15 centimeters of ribbon. Does she have enough ribbon? How do you
know?

Yes, Amy has enough ribbon for five banners

Explanation:

1 meter (m) = 100 centimeters (cm)

Your 5 banners must be 15 centimeters each

Five 15 cm banners added together:

15cm + 15cm + 15cm + 15cm + 15cm = 75 cm

Because we know that 1 meter is 100 centimeters and we know that five banners all together are 75 centimeters, we can subtract 75 centimeters from 100 centimeters to make sure how much ribbon Amy has left. 100 - 75 = 25 centimeters

Because we know 25 centimeters remain after making five 15 centimeter banners, we know for sure that Amy has enough ribbon to complete the banners.