Step-by-step explanation:
We have to perform the following substraction:
4.3 x 10² - 7.0 × 10² = ?
Since both numbers have the same order of magnitude we can directly substract them.
4.3 - 7.0 = -2.7
So the answer to our operation is:
4.3 x 10² - 7.0 × 10² = -2.7 × 10²
Answer: -2.7 × 10²