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Lesson · Grade 2 · Mathematics

Comparing and Ordering Numbers to 100

  • Grade 2
  • Mathematics
  • 1 min 5 s
  • British Columbia
  • BC2-MA-02

Children build 46, 39 and 43 from towers of ten and loose cubes, then compare the tens first: 39 has the fewest tens, so it is the smallest, even though its 9 ones look like a lot. 46 and 43 both have 4 tens, so the ones decide, and the numbers move into order: 39, 43, 46.

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In one sentence

The question this lesson answers

Let's put 46, 39 and 43 in order.

Each tower has ten cubes, so it is one ten.

Transcript

What the lesson says

Let's put 46, 39 and 43 in order.

Each tower has ten cubes, so it is one ten.

46 is 4 tens and 6 ones.

39 is 3 tens and 9 ones.

43 is 4 tens and 3 ones.

First, look at the tens in each number.

39 has only 3 tens, so it is the smallest.

Even 9 ones are less than one ten.

46 and 43 both have 4 tens.

So now we look at the ones.

3 ones is less than 6 ones.

So 43 is less than 46.

From smallest to biggest: 39, 43, 46.

Compare the tens first, then the ones.

Curriculum

Where this fits

British Columbia, Grade 2

Mathematics, Number: number concepts to 100BC2-MA-02

Previous: Skip-Counting by 2s, 5s and 10sNext: Tens and Ones: What Each Digit in 49 Is Worth

The outcomes and strands follow the British Columbia curriculum.

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