6th grade area of triangles worksheets

Triangle area worksheets for sixth grade label each triangle with its base and a dashed height. Your child multiplies base times height and then takes half, because a triangle fills exactly half its box.

Free printable PDF worksheet, aligned to Common Core 6.G.A.1.

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The kind of problems you'll get

Find the area of each triangle.

  1. Area:

    Answer: 8 sq m

  2. Area:
  3. Area:

Every print pulls a fresh set of problems at this level, so a make-up test or a second sibling never gets the same sheet.

What's on each sheet

Every version prints on US Letter or A4, with its answer key on the last page.

How to teach this

The half is the whole lesson, so make it visible once: draw a rectangle, slice it corner to corner, and shade one triangle: half the box, every time. Then let your child choose the order that feels safer, multiplying first and halving at the end, or halving one number first when it's even. If answers keep coming out doubled, the half got skipped; that's the first place to look.

Watch for: Kids forget the half and double every answer. A triangle is half the parallelogram with the same base and height, so divide by 2 at the end. Kids use a slanted side as the height. The height is the dashed line that meets the base at a right angle.

Common questions about area of triangles

Why do we divide by 2?
Two copies of any triangle fit together into a parallelogram with the same base and height. One triangle is half of that, so its area is base times height divided by 2.
Will the answers have fractions in them?
No. Every base and height pair on the sheet multiplies to an even number, so after halving, the areas are whole numbers like 24 sq cm.

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Aligned to Common Core 6.G.A.1. Reviewed by the One more sheet curriculum team. Content version 123, updated July 2026.