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Lesson · Grade 2 · Mathematics

Making 10 to add: 8 + 5

  • Grade 2
  • Mathematics
  • 1 min 5 s
  • British Columbia
  • BC2-MA-06

Eight red and five yellow counters are counted one at a time into two ten-frames. The 5 splits into 2 and 3 so two counters can fill the first frame, and the video shows that 8 + 5 = 8 + 2 + 3 = 10 + 3 = 13, checks it by counting on from ten, and ends on the recap "Make 10 first".

Concept: Making 10 to add

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In one sentence

The question this lesson answers

What is eight plus five? Let's use two ten frames.

Put eight red counters in the first frame.

Transcript

What the lesson says

What is eight plus five? Let's use two ten frames.

Put eight red counters in the first frame.

One, two, three, four, five, six, seven, eight.

Put five yellow counters in the next frame.

One, two, three, four, five.

Eight needs two more to make ten.

So split the five into two and three.

Eight plus five is eight plus two plus three.

Move two yellow counters into the first frame.

Eight, nine, ten. Eight plus two is ten.

Three yellow counters are left. Ten plus three is thirteen.

Count on to check. Ten, eleven, twelve, thirteen.

Make ten first. Eight plus five is thirteen.

Curriculum

Where this fits

British Columbia, Grade 2

Mathematics, Number: addition and subtraction facts to 20 (introduction of computational strategies)BC2-MA-06

Previous: How Many Beans? Estimating with a HandfulNext: Doubles and Near Doubles: 6 + 7

The outcomes and strands follow the British Columbia curriculum.

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