It can have one . . . 1.0 x 1.0 = 1
It can have two . . . 1.0 x 0.1 = 0.1
It can have three . . . 10 x 10 = 100
It can have four . . . 99 x 99 = 9801 and .01 x .01 = .0001
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Take the smallest 2-digit number (10), and see how many digits you get when you multiply it by itself.Also, take the largest possible 2-digit number (99), and see how many digits you get when you multiply it by itself.
two
There are 15 of them.
10 digits are numbers in the billions.
there are 899 whole numbers that have three digits.
119, 191, 911, 331, 313, 133