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Lesson · Grade 2 · Mathematics

Subtracting by Counting Up

  • Grade 2
  • Mathematics
  • 53 s
  • British Columbia
  • BC2-MA-08

To find 13 − 8, the question is turned round into 8 + ? = 13, and a bunny hops along numbered stepping stones from 8 up to 13, saying each number as it lands. Counting the five hops gives the missing number, so 8 + 5 = 13 and 13 − 8 = 5.

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In one sentence

The question this lesson answers

What is thirteen minus eight? Let's find out.

We can ask: eight plus what makes thirteen?

Transcript

What the lesson says

What is thirteen minus eight? Let's find out.

We can ask: eight plus what makes thirteen?

Here is a path of numbered stepping stones.

Our bunny starts on the stone with eight.

It will hop up to thirteen, then stop.

Now count up, one hop at a time.

Hop, nine. Hop, ten. Hop, eleven. Hop, twelve. Hop, thirteen.

Let's count the hops. One, two, three, four, five.

There are five hops, so eight plus five is thirteen.

That means thirteen minus eight is five.

We can subtract by counting up and counting the hops.

Curriculum

Where this fits

British Columbia, Grade 2

Mathematics, Number: addition and subtraction facts to 20 (introduction of computational strategies)BC2-MA-08

Previous: Doubles and Near Doubles: 6 + 7Next: Adding Two-Digit Numbers: Tens and Ones

The outcomes and strands follow the British Columbia curriculum.

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