Add Numbers in Scientific Notation Quick Check

Question

add 7.3 x 10^7 +1.8 x 10^7
which is the correct sum

Answer 1

To add the numbers in scientific notation \( 7.3 \times 10^7 \) and \( 1.8 \times 10^7 \), you can simply add the coefficients since the exponents are the same.

1. Add the coefficients: \[ 7.3 + 1.8 = 9.1 \]

2. Keep the common power of ten: \[ 10^7 \]

So, the sum is: \[ 9.1 \times 10^7 \]

Thus, the correct sum is \( 9.1 \times 10^7 \).