Round
Round is a skill on Pengi from Lesson 17: Rounding and Estimating in Saxon Math, Course 3.
Key Concepts
Property We round a number to a certain place value by inspecting the digit that follows that place. If the digit is 5 or greater we round up. If the digit is less than 5 we round down.
Examples $1,4\underline{8}1,362 \rightarrow 1,500,000$ (The ten thousands digit, 8, is greater than 5, so round up). $5,2\underline{3}4 \rightarrow 5,200$ (The tens digit, 3, is less than 5, so round down). $7\underline{8} \rightarrow 80$ (The ones digit, 8, is greater than 5, so round up).
Explanation Simplifying numbers makes them much easier to use! Think of it like finding the nearest 'friendly' number on a number line that ends in zero. If the digit to the right is 5 or more, you power up to the next level. If it's less than 5, you just slide back down. Easy peasy!
Common Questions
What is Round?
Round is a skill on Pengi from Lesson 17: Rounding and Estimating in Saxon Math, Course 3.
What grade level is Round for?
Round is part of the Grade 8 Math curriculum, covered in Saxon Math, Course 3. It is designed for students studying Math at the Grade 8 level.
How can I learn Round?
Pengi offers an AI-guided lesson for Round that walks you through the key concepts step by step. The lesson is aligned to Saxon Math, Course 3 so the content matches what you see in class.
How do I practice Round?
After learning the concept, use the Practice mode to work through targeted exercises on Round. The AI adapts to your level and gives feedback on each answer so you can identify and fix mistakes.
Which textbook covers Round?
Round is covered in Saxon Math, Course 3, specifically in Chapter 2: Number & Operations • Geometry under Lesson 17: Rounding and Estimating. Pengi's lesson is aligned directly to this textbook so you can follow along with your class.
Is Round free to study on Pengi?
Yes, the core Learn and Practice modes for Round are available for free on Pengi. No credit card is required to start studying.