Week 10 · Graphs and line plots

Tuesday

Scaled bar graphs

// Scaled graphs, rulers and line plots

⏱ about 15 min

Tuesday: Scaled bar graphs

Lizzy spreads a big sheet of paper on a flat rock.

"I sorted the leaves I found by tree," she says.

Bennie draws two lines for the sides of a graph.

"Our scale can count by fives," he says.

"Then each grid line is 5 more leaves."

Lizzy colors three bars. "Now I can compare them at a glance!"

A bar graph shows data with bars.

The scale on the side counts by the same jump, like 5, 10, 15.

Read the top of each bar across to the scale.

$A bar graph of leaves Lizzy found, with a scale by fives$

The oak bar reaches 35. The maple bar reaches 20.

How many more oak leaves? 35 - 20 = 15.

READ THE LEAF GRAPH

$A bar graph, Leaves Lizzy found: Oak 35, Maple 20, Elm 45$ How many oak leaves did Lizzy find?

$A bar graph, Leaves Lizzy found: Oak 35, Maple 20, Elm 45$ How many maple leaves did Lizzy find?

$A bar graph, Leaves Lizzy found: Oak 35, Maple 20, Elm 45$ How many elm leaves did Lizzy find?

HOW MANY MORE OR FEWER?

$A bar graph, Leaves Lizzy found: Oak 35, Maple 20, Elm 45$ How many more elm leaves than oak leaves?

$A bar graph, Leaves Lizzy found: Oak 35, Maple 20, Elm 45$ How many fewer maple leaves than elm leaves?

$A bar graph, Leaves Lizzy found: Oak 35, Maple 20, Elm 45$ How many leaves did Lizzy find in all?

$A bar graph, Leaves Lizzy found: Oak 35, Maple 20, Elm 45$ Oak and maple leaves together: how many more than elm leaves?

Bennie planted seeds each day. His scale counts by tens.

$A bar graph of seeds planted, with a scale by tens$

The Wednesday bar stops halfway between 50 and 60. That is 55.

READ THE SEED GRAPH

$A bar graph, Seeds planted: Mon 40, Tue 70, Wed 55, Thu 90$ How many seeds did Bennie plant on Tuesday?

$A bar graph, Seeds planted: Mon 40, Tue 70, Wed 55, Thu 90$ How many seeds did Bennie plant on Wednesday?

$A bar graph, Seeds planted: Mon 40, Tue 70, Wed 55, Thu 90$ How many more seeds on Thursday than on Monday?

$A bar graph, Seeds planted: Mon 40, Tue 70, Wed 55, Thu 90$ How many seeds did Bennie plant in the four days?

Sentence	True or false?
Each grid line on the leaf graph is 5 more leaves.	?
45 - 35 = 10	?
Bennie planted the most seeds on Tuesday.	?
40 + 70 + 55 + 90 = 255	?

WHY THIS EXERCISEThursday has the tallest bar, 90 seeds.

Try it

Ask four people at home which season they like best.
Make a bar graph on paper with a scale that counts by twos.
Which season got the most votes?

Draw a bar graph with a scale that counts by fives.

Wonderful! Tomorrow we measure with a ruler to the half and fourth inch.

Grown-up checked my answers