6th grade area of triangles worksheets

Tap to see another sample sheet. The picture follows the difficulty you pick.

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.

Each print is a different sheet with its own answer key. You don't need to sign up.

The kind of problems you'll get

Find each area. Show your calculation and include square units.

  1. Base: 8 cm; perpendicular height: 3 cm.

    Answer: (8 × 3) ÷ 2 = 12 cm².

Most problems on this sheet sit beside a picture, model or diagram, so this is the worked example the sheet itself prints. The answer key on page two prints the answer under every problem.

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 a 6th grade sheet

Every version prints on US Letter or A4, with its answer key after the problems.

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 6th grade 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.

Related worksheets

Ready to print one?

Need a fresh set of problems? Print another copy. The difficulty you picked above stays.

Aligned to Common Core 6.G.A.1. Reviewed by the One more sheet team. Content version 240, updated September 2026.

Spot a mistake on this sheet? Tell us. · About these worksheets