Question

Which answer choice shows 4 + 0.3 + 0.09 written in standard form?

A. 43.9
B. 4.39
C. 0.439
D. 0.0439

Answer 1

Solution:

A few changes were made:

• 4 as 4.00.
• 0.3 as 0.30

New equation:

• 4 + 0.3 + 0.09 = 4.00 + 0.30 + 0.09

Solving the equation:

• 4.00 + 0.30 + 0.09
• => 4.39 (Refer to image for work)

Correct option is B.

Answer 2

Answer:

B)

Step-by-step explanation:

4 + 0.3 + 0.09 = 4.39

standard form is written in the form of $a \times 10^n$, where $a$ is a number bigger than or equal to 1 and less than 10.

Therefore, 4.39 written in standard form is $\mathsf{4.39 \times 10^0}$