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Lesson · Grade 1 · Mathematics

Adding Joins Groups, Subtracting Takes Some Away

  • Grade 1
  • Mathematics
  • 1 min 15 s
  • British Columbia
  • BC1-MA-06

Five yellow ducks and three white ducks are counted, then swim together into one group of eight, showing that adding joins groups: 5 + 3 = 8. Then two ducks fly away and the six left are counted, showing that taking some away is subtracting: 8 − 2 = 6.

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In one sentence

The question this lesson answers

Look at the yellow ducks on the pond.

Let's count the yellow ducks together. 1, 2, 3, 4, 5.

Transcript

What the lesson says

Look at the yellow ducks on the pond.

Let's count the yellow ducks together. 1, 2, 3, 4, 5.

So there are 5 yellow ducks.

Now 3 white ducks swim over. 1, 2, 3.

Adding joins the two groups together.

How many ducks are there now? 1, 2, 3, 4, 5, 6, 7, 8.

Now there are 8 ducks on the pond. 5 plus 3 equals 8.

Then 2 of the 8 ducks fly away.

Subtracting takes 2 away from the 8.

How many ducks are left now? 1, 2, 3, 4, 5, 6.

Now there are 6 ducks on the pond. 8 minus 2 equals 6.

When we join groups, we add. When we take some away, we subtract.

Curriculum

Where this fits

British Columbia, Grade 1

Mathematics, Number: addition and subtraction to 20 (understanding of operation and process)BC1-MA-06

Previous: Making 10: Counters and Empty SpacesNext: Make a 10 First: 8 + 5

The outcomes and strands follow the British Columbia curriculum.

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