NZ Level 3
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Ordering Fractions II
Lesson

No benchmarks?

You may have seen how we can use benchmarks such as $0$0, $\frac{1}{2}$12 and $1$1to put our fractions in order, by getting a sense of how big our fractions are. We can also compare fractions without using these benchmarks. There are a few types of fractions we can look at.

Comparing fractions

When we compare fractions, the first thing to do is check the denominator of each fraction. If they are the same, we can look at the numerators. But what if they're not? In this video, we'll look at both cases, and find out how to compare fractions either way.

Worked Example

Question 1

Use $<$< or $>$> to complete the following number sentence.

  1. $\frac{1}{9}\editable{}\frac{1}{8}$1918

Mixed numbers and improper fractions

What if we have want to compare mixed fractions to improper fractions? Fear not! We have a plan, so watch how we tackle this type of comparison in this video.

Worked Examples

Question 2

We want to arrange the following fractions in ascending order: $\frac{9}{16}$916, $\frac{11}{112}$11112, $\frac{5}{7}$57

  1. What is the lowest common denominator of the $3$3 fractions?

  2. Rewrite all three fractions with the lowest common denominator between them.

    $\frac{5}{7}=\frac{\editable{}}{112}$57=112

    $\frac{9}{16}=\frac{\editable{}}{112}$916=112

    $\frac{11}{112}=\frac{\editable{}}{112}$11112=112

  3. Hence, which of the following lists the fractions in ascending order?

    $\frac{11}{112},\frac{9}{16},\frac{5}{7}$11112,916,57

    A

    $\frac{5}{7},\frac{9}{16},\frac{11}{112}$57,916,11112

    B

    $\frac{9}{16},\frac{11}{112},\frac{5}{7}$916,11112,57

    C

    $\frac{11}{112},\frac{9}{16},\frac{5}{7}$11112,916,57

    A

    $\frac{5}{7},\frac{9}{16},\frac{11}{112}$57,916,11112

    B

    $\frac{9}{16},\frac{11}{112},\frac{5}{7}$916,11112,57

    C

Question 3

We want to arrange the following in ascending order:

$2\frac{1}{7}$217, $\frac{33}{14}$3314, $\frac{16}{7}$167

  1. First, rewrite all $3$3 fractions as improper fractions with the common denominator of $14$14.

    $2\frac{1}{7}=\frac{\editable{}}{14}$217=14

    $\frac{33}{14}=\frac{\editable{}}{14}$3314=14

    $\frac{16}{7}=\frac{\editable{}}{14}$167=14

  2. Therefore which of the following lists the fractions in ascending order:

    $\frac{16}{7}$167, $2\frac{1}{7}$217, $\frac{33}{14}$3314

    A

    $\frac{33}{14}$3314, $\frac{16}{7}$167, $2\frac{1}{7}$217

    B

    $2\frac{1}{7}$217, $\frac{16}{7}$167, $\frac{33}{14}$3314

    C

    $2\frac{1}{7}$217, $\frac{33}{14}$3314, $\frac{16}{7}$167

    D

    $\frac{16}{7}$167, $2\frac{1}{7}$217, $\frac{33}{14}$3314

    A

    $\frac{33}{14}$3314, $\frac{16}{7}$167, $2\frac{1}{7}$217

    B

    $2\frac{1}{7}$217, $\frac{16}{7}$167, $\frac{33}{14}$3314

    C

    $2\frac{1}{7}$217, $\frac{33}{14}$3314, $\frac{16}{7}$167

    D

 

Remember!

In order to compare fractions, having the same denominator helps enormously, so you may need to find equivalent fractions if they are not the same. Converting mixed numbers to improper fractions might be needed as well, so remember to think of which steps can help you achieve the same denominators. Then, you're ready to compare, and order, your fractions.

Outcomes

NA3-1

Use a range of additive and simple multiplicative strategies with whole numbers, fractions, decimals, and percentages.

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