These are all the two-digit multiples of ten: 10, 20, 30, 40, 50, 60, 70, 80, 90.
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The first squared number that is a multiple of 10 is three digits.
I believe there are 81. There are 9 after every multiple of 10, including 90.
04, 40 08, 80 44, 44 48, 84 88, 88 Three of them if you don't count the first two.
999 is a three-digit multiple of 9
The smallest two-digit composite number is 10, which is the product of 2 and 5. The largest two-digit composite number is 99, which is the product of 3 and 33. To find the sum of the smallest and largest two-digit composite numbers, we add 10 and 99, resulting in 109.