1
Read coordinates
Coordinates tell a position on a grid. They are written as an ordered pair (x, y).
0(2, 3)(4, 1)
Read x first, then y.
Coordinates, Ratios, and Proportions
Discover coordinates, compare ratios, and understand
simple proportions.
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Let’s learn coordinates, ratios, and proportions!
2
Understand ratios
A ratio compares two groups of objects. We can write it using a colon (:).
🍎 🍎 🍎
🍏 🍏
3 : 2
There are 3 red apples
for every 2 green apples.
for every 2 green apples.
3
Simple proportions
Proportions show equal ratios. Two ratios are proportional if they compare in the same way.
=
2 : 4 = 1 : 2
Both sides compare
in the same way.
in the same way.
4
Use visual models
We can use a coordinate grid to locate points and ratio models to compare amounts fairly.
★(3, 2)
Red : Blue = 3 : 2
Coordinates help us find places, and ratios help us compare amounts!
Which coordinate matches the star?
Choose the correct answer.