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There are no two square numbers that add up to 90. The closest pair of square numbers that add up to 90 is 64 and 25, which equals 89.
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Square numbers of integers falling between 50 and 90 are: 82 = 64 92 = 81
There are 89 numbers between 1 and 90, inclusive. This is because when counting the numbers between two endpoints, you subtract the starting number from the ending number and then add 1. So, 90 - 1 + 1 = 90. But since we are looking for the numbers between 1 and 90, we need to subtract 1, resulting in 89 numbers.
They are: 9+81 = 90