# Section C: Practice Problems Count Groups of 11–20 Images

## Section Summary

## Details

In this section, we counted groups of up to 20 things.

We counted things in lines, arrays, circles, and on 10-frames.

We wrote numbers to show how many images there are.

## Problem 1 (Lesson 11)

How many triangles are there?

There are triangles.

Lin wrote the equation

to show the number of hexagons. Color the hexagons to show Lin’s equation.

## Problem 2 (Lesson 12)

How many squares are there?

There are squares.

How many circles are there?

There are circles.

## Problem 3 (Exploration)

Pick some of the flowers in the picture.

How many are there?

Share your answer with a partner.

Can you guess which flowers your partner counted?

## Problem 4 (Exploration)

Pick a shape in one of the designs and figure out how many there are.