KShapesK.G.B.6

Building and Combining Shapes

Make shapes from parts, and put small shapes together to make bigger ones.

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You know sides and corners. Now put small shapes together to make bigger ones.

2 triangles make a square. 2 squares make a rectangle. 6 triangles make a hexagon.

Key idea

Small shapes can fit together to make new, bigger shapes.

Why it works

When pieces fit with no gaps, the outside edge makes a new shape. You can trace the outside edge to name it.

Worked example: Two triangles

What can two triangles that are the same make?
  1. Put their long sides together.
  2. The outside edge has 4 sides and 4 square corners.
  3. It is a square (or a rectangle, if the triangles are long and thin).

Answer: A square or a rectangle

For grown-ups: Cut a paper square from corner to corner and let your child put it back together. Then try making a big triangle with the same two pieces.

Practice

Pass with 3 right answers, the last 2 in a row. Each right answer earns 1 XP.

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Builds on

Leads to

This is one of the top rungs of Kindergarten.

Sources and further reading

  • Common Core State Standards for Mathematics, Kindergarten, K.G.B.6: compose simple shapes to form larger shapes
  • Institute of Education Sciences practice guide: Teaching Math to Young Children (NCEE 2014-4005)
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