# Calculate the volume of the rectangular parallelepiped using the formula V = ABC

**Calculate the volume of the rectangular parallelepiped using the formula V = ABC, if a = 4.2 dm, b = 6.5 dm, c = 0.8 dm, round the result to one.**

Since the units of measurement of the sides of the parallelepiped are expressed in decimeters, that is, there is no need to equalize the values, then we substitute the values a = 4.2 (dm), b = 6.5 (dm) and c = 0.8 (dm) into the given formula : V = a * b * c = 4.2 (dm) * 6.5 (dm) * 0.8 (dm) = 21.84 (dm3).

Let’s round the result up to one.

Since the last digit is 4, the penultimate digit 8 does not change, that is: 21.84 (dm3) ≈ 21.8 (dm3). We take the next digit, the last digit is 8, which means that the penultimate digit 1 is increased by 1, that is, 1 + 1 = 2 and at the same time: 21.8 (dm3) ≈ 22 (dm3).

Answer: the volume of a parallelepiped is 22 cubic decimeters.