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Straws and Glasses - Proportional Reasoning

Students draw 2 or 5 straws in each glass. They count to tell the number of straws in all. Encourage students to count by 2s or by 5s to figure out the total. Provide crayons or markers for drawing. You may want to do problems 1, 2 and 3,that focus on counting by 2s, as a class exploration. Likewise, 7, 8 and 9, that focus on counting by 5s, may be good to complete as a whole class activity.

Solutions

Draw 2 in each glass.

Count the straws.

How many straws in all?

1.

________________ straws in all

2.

________________ straws in all

3.

________________ straws in all

Draw 2 in each glass.

Count the straws.

How many straws in all?

4.

________________ straws in all

5.

________________ straws in all

6.

________________ straws in all

Draw 5 in each glass.

Count the straws.

How many straws in all?

7.

________________ straws in all

8.

________________ straws in all

9.

________________ straws in all

Draw 5 in each glass.

Count the straws.

How many straws in all?

10.

________________ straws in all

11.

________________ straws in all

12.

________________ straws in all

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