PROOF 73

Prove.

Shifting the decimal point multiplies by 10 or by 1/10

On place-value notation.

Definition D1

The place-value notation aₘ…a₁a₀.a₋₁…a₋ₙ means aₘ·10ᵐ + … + a₀·10⁰ + a₋₁·10⁻¹ + … + a₋ₙ·10⁻ⁿ.

Proof.

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