A ratio compares two amounts, like 2 cats for every 3 dogs. To say and build ratios you have to count groups and use skip counting and multiplication. Warm those up and ratios click.
These are words you'll need to already know to follow this lesson — not the new words the lesson teaches. Review each one, its meaning, and the example so the new lesson makes sense from the start.
Level 1 To name numbers in order to find how many things are in a group.
Example: Count the apples: 1, 2, 3 — there are 3 apples.
Level 1 To count by jumping the same amount each time.
Example: Skip count by 2: 2, 4, 6, 8.
Level 1 To add the same number many times to find a total.
Example: 3 × 4 means add 3 four times: 3 + 3 + 3 + 3 = 12.
Level 1 A set of things you put or count together.
Example: Put the marbles in 2 equal groups of 5.
These check the skills you'll need for this lesson — not the new lesson itself. Answer all 3, then press Show my path. No grade — it just suggests where to start.
1. Skip count by 2: 2, 4, 6, ___?
2. What is 3 × 4?
3. There are 4 red apples and 2 green apples. How many apples in all?
Vocabulary previewed and basics checked. Time to start the lesson.
Start Lesson 3-1 →