Displaying Data with a Bar Graph

Objectives - To measure length to the nearest 1/2 centimeter; and to make and use bar graphs for a set of collected data.

1 Teaching the Lesson

Students measure their head sizes to the nearest half-centimeter. They find the median head size and make a bar graph of the data. [Measurement and Reference Fames; Data and Chance]

• Math Journal 1, p. 42 and 43

• half sheet of paper

• tape measure

• Study Link 2.7

• ruler

• stick-on notes

See Advance Preparation

2 Ongoing Learning & Practice

Students solve multidigit addition problems. [Operations and Computation]

Students practice and maintain skills through Math Boxes and Study Link activities.

• Math Journal 1, p. 44 and 45

• Study Link 28 (Math Masters, p. 246)

3 Options for Individualizing

Enrichment - Students analyze a product claim by using their head-size data. [Data and Chance; Measurement and Reference Frames]

Extra Practice - Students practice measuring and drawing line segments to the nearest half centimeter. [Measurement and Reference Frames]

• Math Journal 1, p. 43

• Teaching Master (Math Masters, p. 22)

• caps (1 per group of 5 to 6 students)

• tape measure (1 per small group)

• half sheet of paper

See Advance Preparation

Additional Information

Advance Preparation - Before beginning the lesson, place half-sheets of paper near the Math Message. For the optional Enrichment activity in Part 3, you will need 4 of 5 caps with adjustable headbands.

Vocabulary · bar graph

Mental Math and Reflexes

Dictate large numbers. Have students write them on their slates. For each number, ask questions such as the following:

• Which digit is in the millions place?

• What is the value of the digit x?

• How many hundred-millions are there?

Math Message

Use your ruler and a half-sheet of paper. Draw line segments whose lengths are 1/2 cm; 4 cm; 4 1/2 cm; and 11 1/2 cm

Study Link 2.7 Follow-Up

Go over the answers. Ask students to make ballpark estimates to check their answers.