0.7 = 7.0 × 10-1
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To write seven and five tenths in standard form, you would simply add the whole number part (7) to the decimal part (0.5). This would give you 7.5 in standard form.
2 7/10. To make an improper fraction it would be 27/10.
7.5(7 x 1) + (5/10)
7,000,000,000
7/1000 = 0.007