Lesson · Grade 4 · Mathematics
Close to 0, One Half or 1? Estimating Fractions with Benchmarks
- Grade 4
- Mathematics
- 1 min 15 s
- British Columbia
- BC4-MA-05
The video draws 1/8, 6/10 and 5/6 as shaded strips lined up with a number line from 0 to 1, with a dashed line marking one half. It shows why each is close to a benchmark (half of 8 is 4 and 1 is much less, half of 10 is 5 and 6 is close to 5, 5 is only 1 less than 6), then drops each fraction onto the number line to order them as 1/8 < 6/10 < 5/6.
Concept: Estimating fractions with benchmarks: close to 0, one half or 1
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In one sentence
The question this lesson answers
Is each of these fractions close to 0, one half or 1?
0, one half and 1 are handy numbers called benchmarks.
Transcript
What the lesson says
Is each of these fractions close to 0, one half or 1?
0, one half and 1 are handy numbers called benchmarks.
This dashed line marks one half, halfway from 0 to 1.
For one eighth, shade 1 of 8 equal parts.
Half of 8 is 4, and 1 is much less than 4.
So one eighth is close to 0.
For six tenths, shade 6 of 10 equal parts.
Half of 10 is 5, and 6 is close to 5.
So six tenths is close to one half.
For five sixths, shade 5 of 6 equal parts.
5 is only 1 less than 6.
So five sixths is close to 1.
On the number line, each fraction sits near its benchmark.
From least to greatest, they are one eighth, six tenths and five sixths.
To estimate a fraction like these, ask if it is close to 0, one half or 1.
Curriculum
Where this fits
- British Columbia, Grade 4
Mathematics, Number: ordering and comparing fractionsBC4-MA-05
Previous: Comparing and Ordering Fractions with the Same DenominatorNext: Friendly Numbers and Compensating: 2998 + 1456
The outcomes and strands follow the British Columbia curriculum.
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