The area of a parallelogram is just base × height — the same idea as a rectangle. So if your rectangle area and multiplication facts are warm, parallelograms click instantly. You also need to know which side is the base and which measurement is the height.
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 add the same number many times to find a total.
Example: 8 × 4 means add 8 four times: 8 + 8 + 8 + 8 = 32.
Level 1 A four-sided shape with four square corners.
Example: A door is shaped like a rectangle with four square corners.
Level 1 How much flat space is inside; you find it by length times width.
Example: A rectangle 5 cm by 3 cm has area 5 × 3 = 15 square cm.
Level 1 The little squares we use to measure area, like square cm.
Example: If 12 small squares fit inside, the area is 12 square units.
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. What is 8 × 4?
2. A rectangle is 5 cm long and 3 cm wide. What is its area?
3. Area is measured in which kind of units?
Vocabulary previewed and basics checked. Time to start the lesson.
Start Lesson 5-1 →