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Grade 6 · Maths · Lessons
Two for every three
🔴red beads🔵blue beads📖in order🗣️to
Two for every three.
The big ideaA ratio compares two amounts, in order. The first name gets the first number.

How it works

A ratio compares two amounts, in order. The first name gets the first number.

Mia has 5 red beads and 1 blue bead: the ratio of red to blue is 5 to 1.

Write it as 5 to 1, 5 : 1, or 5/1.

5 red, 1 blue• red to blue: 5 to 1• blue to red: 1 to 5Order matters• the first named comes first
Red to blue.

Example 1: Say it

  1. Leo has 3 dog stickers and 5 cat stickers.
  2. The ratio of dog to cat names dog first.
  3. It is 3 to 5.

Example 2: Reverse

  1. The ratio of cat to dog stickers.
  2. Now cat comes first.
  3. It is 5 to 3.

Example 3: Another

  1. Ava has 3 student tickets and 8 teacher tickets.
  2. Student to teacher.
  3. 3 to 8.

Words to know

ratio
A comparison of two amounts, in order.
to
The word we say between the two numbers.

Watch out

Try it

  1. 4 apples and 7 pears. Ratio of apples to pears?
  2. Ratio of pears to apples?
  3. 2 boys and 3 girls. Ratio of girls to boys?
  4. Does order matter in a ratio?
Answers: 1. 4 to 7 · 2. 7 to 4 · 3. 3 to 2 · 4. yes
For grown-upsName the ratio of two kinds of fruit in the bowl.
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