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Lesson · Grade 1 · Mathematics

Adding and subtracting are related

  • Grade 1
  • Mathematics
  • 1 min 23 s
  • British Columbia
  • BC1-MA-09

A row of 3 red apples and 5 green apples is counted one apple at a time: 3 red, 5 green and 8 in all. The same picture then gives four facts, 3 + 5 = 8, 5 + 3 = 8, 8 − 5 = 3 and 8 − 3 = 5, as the green and then the red apples are taken away, and it ends on the recap "Adding and subtracting are related."

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In one sentence

The question this lesson answers

Here are some red and green apples.

Count the red apples: 1, 2, 3. So there are 3 red apples.

Transcript

What the lesson says

Here are some red and green apples.

Count the red apples: 1, 2, 3. So there are 3 red apples.

Count the green apples: 1, 2, 3, 4, 5. So there are 5 green apples.

Now count them all: 1, 2, 3, 4, 5, 6, 7, 8. So there are 8 apples in all.

3 red and 5 green make 8. So 3 plus 5 equals 8.

Now start with the 5 green apples. 5 plus 3 equals 8 too.

Now take away the 5 green apples.

Look, 3 red apples are left. So 8 minus 5 equals 3.

Put the 5 green apples back.

This time, take away the 3 red apples.

Look, 5 green apples are left. So 8 minus 3 equals 5.

These four facts all use 3, 5 and 8.

Adding and subtracting are related: one picture, four facts.

Curriculum

Where this fits

British Columbia, Grade 1

Mathematics, Number: addition and subtraction to 20 (understanding of operation and process)BC1-MA-09

Previous: Doubles: Adding a Number to Itself

The outcomes and strands follow the British Columbia curriculum.

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