Answer :
the easiest way to find the answer is to multiply 2 x 2 and then add two zeros on the end. the answer is 400
400. 20×20=400 Its just like 2×2 but adding 2 more 0's. Why you should add the two 0's is because theres only one 0 at the end of 20 but there 2 20's which makes it 400.
