Question

expanded form 19.780​

Answer 1

1×10 + 9×1 + 7×(1/10) + 8×(1/100) + 0×(1/1000)

= 10+9+(.7)+(.08)+(.000)

= 19+(.780). .

= 19.780

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Answer 2

1×10+9×1+7/10+8/100+0/1000