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CCSS.Math:

Mary's rectangular poster is 36 inches by 20 inches Susan's rectangular poster is 26 inches by 30 inches which poster has a larger area and by how many square inches so let's think about these so this is Mary's poster Mary's poster is 36 inches by 20 inches so it's 36 inches by 20 inches by 20 inches 20 inches so it might look something like that so the area the area is going to be 36 times 20 square inches 36 times 2 is 72 so 36 times 20 is going to be 720 square inches square inches now let's think about Susan's situation so let's draw Susan's poster Susan's poster is 26 inches by 30 inches so 26 inches by 30 inches by 30 inches so Susan's poster might look something like that that's Susan's poster my best attempt to draw a rectangle what's the area here the area is 26 times 30 square inches which is equal to let's actually multiply this one out 26 times 30 so we can immediately just throw it let's see we could do 26 times 3 and essentially add a 0 there so 3 times 6 is 18 3 times 2 is 6 plus 1 is 78 and actually I could have probably done that in my head 3 times 20 is 60 plus 3 times 6 is 18 gets to 78 this isn't 3 times 26 3 times 26 would be 78 30 times 26 is 780 so it's 780 square inches so whose poster whose which poster has a larger area Susan's Susan's poster has a larger area and by how many square inches well hers is 780 square inches while Mary's is 720 square inches so it's by 60 square inches 780 - 720 would be 60