Oh, what a happy little question! Let's take a moment to appreciate the square numbers between 20 and 90. We have 25, 36, 49, and 64 - each one a unique and beautiful creation on its own. Just like painting a picture, each square number adds its own special touch to the canvas of mathematics.
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The square numbers between 20 and 90 are 25, 36, 49, and 64. A square number is a number that results from multiplying a number by itself. In this case, the square roots of 25, 36, 49, and 64 are 5, 6, 7, and 8 respectively. So, the square numbers between 20 and 90 are 5^2, 6^2, 7^2, and 8^2.
Oh, dude, square numbers are just numbers you get when you multiply a number by itself. So, between 20 and 90, you've got 25 (5 x 5), 36 (6 x 6), 49 (7 x 7), and 64 (8 x 8). Like, it's not rocket science, just basic math, man.
The square numbers between 40 and 90 are: 49, 64, 81. This is because 7 squared = 49. 8 sqd. = 64. 9 sqd. = 81.
9 and 10
25, 36, 49, 64, 81
There are an infinite number of mixed numbers in that range that are squares. If you limit it to whole numbers, then there are only four: 36, 49, 64, and 81.
There are 90 such numbers.