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The expanded form of 712 is (7 x 100) + (1 x 10) + 2.
Oh, honey, it's simple. 712 in expanded form is 700 + 10 + 2. See, you just break it down into its place values like a piece of cake.
712 = 7.12*102
As 712 is ending by an even digit then it can be divided by 2 thus 712 is not prime
0.712 repeating is a rational number because it can be expressed as a fraction in the form of 712/999