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Lesson · Grade 2 · Mathematics

How Many Beans? Estimating with a Handful

  • Grade 2
  • Mathematics
  • 59 s
  • British Columbia
  • BC2-MA-05

A jar of beans raises the question of whether it holds closer to 25, 50 or 100. One handful is counted in fives to 25, two handfuls fill the jar so 25 plus 25 makes an estimate of about 50, and counting every bean (48) shows that a handful you know helps you make a close estimate.

Concept: Estimating with 25, 50 and 100

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In one sentence

The question this lesson answers

Here is a big jar of beans. How many beans are inside it?

Is it closer to 25, 50 or 100?

Transcript

What the lesson says

Here is a big jar of beans. How many beans are inside it?

Is it closer to 25, 50 or 100?

Here is one handful of beans.

Let's count them in fives: 5, 10, 15, 20, 25.

So one handful holds about 25 beans.

One handful fills about half the jar.

So about two handfuls fill the jar.

Add them: 25 plus 25 equals 50.

So our estimate is about 50 beans.

Now let's count every bean to check.

There are 48 beans in the jar. That is very close to 50.

Use a handful you know to estimate.

Curriculum

Where this fits

British Columbia, Grade 2

Mathematics, Number: benchmarks of 25, 50, and 100 and personal referentsBC2-MA-05

Previous: Even and Odd Numbers: Can Every Sock Find a Partner?Next: Making 10 to add: 8 + 5

The outcomes and strands follow the British Columbia curriculum.

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