Worked Example 1
Decimal Edges
A box is 4 cm long, 2.5 cm wide, and 3 cm high. Find its volume.
- 1V = 4 × 2.5 × 3
- 24 × 2.5 × 3 = 30
Answer: 30 cubic centimeters
Florida Grade 6 Math · Geometric Reasoning
MA.6.GR.2.3: Volume of Rectangular Prisms
What this Grade 6 benchmark means, worked examples, common mistakes, and a free printable worksheet.
Created by a Florida mom · Published by Tropical Learning LLC
What Is Benchmark MA.6.GR.2.3?
Students find the volume of right rectangular prisms with positive rational edge lengths (including fractions and decimals) using visual models and the formula V = length × width × height.
They also find a missing dimension when the volume is known. Volume is measured in cubic units.
Official benchmarkSolve mathematical and real-world problems involving the volume of right rectangular prisms with positive rational number edge lengths using a visual model and a formula.
On the FAST test: part of the Grade 6 reporting category Geometric Reasoning, Data Analysis, and Probability, which is about 25–36% of the test.
Worked Examples
Worked Example 2
Missing Dimension
A box has a volume of 60 cubic inches. It is 5 inches long and 4 inches wide. How tall is it?
- 15 × 4 × h = 60, so 20 × h = 60
- 260 ÷ 20 = 3
Answer: 3 inches
Common Mistakes to Watch For
Adding the edge lengths
Wrong:4 + 2.5 + 3 = 9.5 cubic cm
Volume multiplies the three dimensions: 4 × 2.5 × 3 = 30 cubic cm.
Using square units
Wrong:The volume is 30 square centimeters.
Volume fills space, so it is in cubic units: 30 cubic centimeters.
Helpful Math Tip
Fill a small box with sugar cubes or blocks, then compare the count with length × width × height.
Related Grade 6 Skills
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