Volume is length × width × height. If the volume and two of the edges are known, the missing edge can be found by dividing: first multiply the two known edges, then divide the volume by that product. A box of 120 cubic units that is 6 long and 5 wide is 120 ÷ 30 = 4 units high.
On this fifth grade sheet a child gets the volume and two edges of eight boxes and writes the missing edge on the line. Each version has different boxes, and the answer key gives every missing edge.
What your child will learn
Use volume = length × width × height
Multiply the two known edges
Divide the volume by their product
Check by multiplying all three edges
Common Core standard: 5.MD.C.5
Worked example
Volume 120, length 6, width 5: 6 × 5 = 30, and 120 ÷ 30 = 4, so the height is 4.
Common mistake
Adding the edges, or dividing the volume by only one of them.
Helpful hint
Multiply the two edges you know, then divide the volume by the result.
Questions parents ask
What is the most common mistake with volume missing dimension?+
Adding the edges, or dividing the volume by only one of them.
How can I help my child with volume missing dimension?+
Multiply the two edges you know, then divide the volume by the result.
Are these 5th grade math worksheets free to print?+
Yes. All 6 printable versions on this page are free to download and print, with no account needed.
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