Lesson · Grade 5 · Mathematics
Double bar graphs with a scale
- Grade 5
- Mathematics
- 1 min 27 s
- British Columbia
- BC5-MA-35
Two classes' cans for three days are graphed first with one square for each can, until Tuesday's 30 squares will not fit on the graph. Then every five small squares join into one square, the scale counts by 5s, and the finished double bar graph is read and checked, ending with one extra square meaning 5 more cans (30 − 25 = 5).
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In one sentence
The question this lesson answers
Two classes collected cans for recycling on three days.
This double bar graph has two bars for each day, one for each class.
Transcript
What the lesson says
Two classes collected cans for recycling on three days.
This double bar graph has two bars for each day, one for each class.
First, let one square stand for one can.
On Monday, Class A collected 10 cans and Class B collected 15.
On Tuesday, Class A collected 30 cans, but 30 squares will not fit.
So let one square stand for five cans instead.
Every five small squares join to make one square.
Now the scale counts by fives, from 0 to 30.
Monday's bars still show 10 cans and 15 cans.
Now Class A's 30 cans on Tuesday need just 6 squares.
For Class B, count by fives: 5, 10, 15, 20, 25 cans.
On Wednesday, Class A collected 20 cans and Class B collected 15.
On Tuesday, Class A's bar has one more square than Class B's.
That one square is 5 more cans, because 30 minus 25 is 5.
Always check the key, because one square can stand for one or for many.
Curriculum
Where this fits
- British Columbia, Grade 5
Mathematics, Data and probability: one-to-one correspondence and many-to-one correspondence, using double bar graphsBC5-MA-35
The outcomes and strands follow the British Columbia curriculum.
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