Compose 2D and 3D Shapes to Form New Shapes

Students will combine two or more two-dimensional or three-dimensional shapes to create a new composite shape. Students identify the original shapes within the composite and describe how the smaller shapes fit together.

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Grade 1 · Geometry: Shapes and Their Attributes · question 1 of 3

How it is taught

0:00 of 2:15

Small shapes can make a new shape.

Edges must match with no gaps.

Read it: Put flat shapes together

4 squares fit together. Go around the outside edge: 4 equal sides and 4 square corners. They make a bigger square.

Look at the pieces.
Go around the outside edge.
Name the shape the edge makes.

The lines inside show the pieces. The outside edge shows the new shape.

2 squares side by side make a rectangle.

A shape made of pieces can be split back into them.

Fitted pieces make a new shape. Name it by its outside edge.

Counting 4 shapes because there are 4 pieces.

Go around the outside: 4 equal sides and 4 square corners. Together they make 1 bigger square.

3 triangles can fit together to make a ___ — trapezoid. 3 triangles in a row, points up and down, make a trapezoid: 4 sides, 2 of them running side by side.

square + triangle = house

Today we'll put shapes together to make a brand new shape! Here are two shapes to start with.

This one is a square. It has 4 equal sides and 4 corners.

And this one is a triangle. It has 3 sides and 3 corners.

Grade 1 · Putting shapes together to make new shapes

What do you think we can build if we put them together?

First, let's place the square down. This will be the bottom.

Now let's set the triangle right on top of the square.

Look — we made a house! A brand new shape from two old shapes.

Can you still see the square? It's the bottom part of our house.

And the triangle is still there too — it's the roof on top.

One square plus one triangle makes a house. When we put shapes together, we make new shapes!

What you see

While they climb, your page writes one true line to ask about tonight, and a short note each Sunday.

MayaGrade 3 · Mathematics

Did you know?

A chessboard has 64 squares — share them out between the 8 rows and each row holds exactly 8.

Today’s goal: 1 star — one skill mastered, every rung of its ladder climbed
Climbing now: Divide within 100

An example student.

MayaGrade 3 · Mathematics

Maya earned 2 stars this week — Interpret multiplication as equal groups, which took 6 answers over 3 days before its star landed 3 days ago and Multiply by 6, 7, 8 and 9. Next up: Divide within 100.

An example week.

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