Louis has a bag of 2510 shells each pen shell is 18 cm long what is the combine length of the pen shells in meters

Which geometric principle is used to justify the construction below?

Olivia is using 160 quilt squares to make a red, yellow, and blue quilt if 25% of the quilt are red and 30% are yellow how many quilt squares are blue

Angie has saved 3/8 of the amount she needs to buy a bike. clive has saved 7/10 of the amount he needs to buy a skateboard. what is the difference between clive's and angie's fraction of savings?