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