If you know what the area is for a rectangle you will get this easy. Also if you don't know how to multiply 2 digit numbers then you can't get this. L x W means length x width. Length is 20cm. Width is 15cm. Just multiply both of them and you get the answer.
If know you what analogies are then you would understand my picture. We did this post to understand what analogies are and how it would effect our writing.
my analogie is door knob is to door as key is to...
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