The trapezoid area formula adds the two parallel bases, multiplies by the height, then takes half. So the feeder skills are adding, multiplying, and halving a number (multiplying by 1/2). Warm these up and the formula is just three clean steps.
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 put numbers together to find a total.
Example: If the two sides are 6 and 4, then 6 + 4 = 10.
Level 1 To add the same number many times to find a total.
Example: 6 × 8 means add 6 eight times, which equals 48.
Level 1 One of two equal parts; the same as dividing by 2.
Example: Half of 12 is 6, because 12 ÷ 2 = 6.
Level 1 A four-sided shape with four square corners.
Example: A book cover is shaped like a rectangle.
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 7 + 5?
2. What is half of 12?
3. What is 6 × 8?
Vocabulary previewed and basics checked. Time to start the lesson.
Start Lesson 5-2 →