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The expanded form of 712 is (7 x 100) + (1 x 10) + 2.
That IS the standard form.
You write 20.7 in standard form as: 2.07 × 101
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.
67.24 is the standard form.