400 x 4 = 1600
Therefore, four digits.
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two
There are seven digits: 8,000,000
There are 15 of them.
Seven, to start with, but the last of these digits is a zero. So effectively there will be six.
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