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Lesson · Grade 7 · Mathematics

Adding integers on a number line

  • Grade 7
  • Mathematics
  • 48 s
  • British Columbia
  • BC7-MA-08

To work out 3 + (−5), we start at 3 on a number line, and because we are adding a negative we take 5 steps to the left, going past zero to land on −2. The video ends with the rule: start at the first number, then move right to add a positive and left to add a negative.

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In one sentence

The question this lesson answers

What is 3 plus negative 5?

We can work it out on a number line.

Transcript

What the lesson says

What is 3 plus negative 5?

We can work it out on a number line.

Start at the first number, which is 3.

Adding a positive number moves you to the right.

Adding a negative number moves you to the left.

We are adding negative 5, so we move to the left.

Take 5 steps to the left, one at a time.

After 3 steps we reach zero, so we keep going.

After 5 steps, we land on negative 2.

So 3 plus negative 5 equals negative 2.

Start at the first number, then move right for a positive and left for a negative.

Curriculum

Where this fits

British Columbia, Grade 7

Mathematics, Number: operations with integersBC7-MA-08

Previous: Comparing and ordering integersNext: Adding Integers with Counters and Zero Pairs

The outcomes and strands follow the British Columbia curriculum.

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