Add 430 × 106) + 9.75 × 108) = , .
A) 1.4 × 109, 1.4 Giga
B) 14 × 109, 1.4 Giga
C) 1.4 × 109, 1.4 Mega
D) 14 × 109, 1.4 Giga.

Question

Quizplus · Accepted Answer

First, convert both numbers to the same power of ten for easier addition: $430 \times 10^6 = 4.3 \times 10^8$ and $9.75 \times 10^8$. Adding these gives $4.3 \times 10^8 + 9.75 \times 10^8 = 14.05 \times 10^8 = 1.405 \times 10^9$, which rounds to $1.4 \times 10^9$, or 1.4 Giga.