Checking Arithmetic with Inverses
Checking Arithmetic with Inverses is a skill on Pengi from Lesson 2: Operations of Arithmetic in Saxon Math, Course 3.
Key Concepts
Property If $a + b = c$, then $c b = a$. If $a \times b = c$, then $c \div b = a$.
Examples To check if $706 327 = 379$ is correct, you can add: $379 + 327 = 706$. To find the missing number in $8y = 48$, you can use division: $y = 48 \div 8 = 6$. If $x+15=40$, you find x by subtracting: $x = 40 15 = 25$.
Explanation Addition and subtraction are opposites that undo each other, and the same is true for multiplication and division! You can use this powerful relationship to check your work or find a missing number in an equation. Think of it as having a built in error checker for your arithmetic answers.
Common Questions
What is Checking Arithmetic with Inverses?
Checking Arithmetic with Inverses is a skill on Pengi from Lesson 2: Operations of Arithmetic in Saxon Math, Course 3.
What grade level is Checking Arithmetic with Inverses for?
Checking Arithmetic with Inverses 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 Checking Arithmetic with Inverses?
Pengi offers an AI-guided lesson for Checking Arithmetic with Inverses 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 Checking Arithmetic with Inverses?
After learning the concept, use the Practice mode to work through targeted exercises on Checking Arithmetic with Inverses. The AI adapts to your level and gives feedback on each answer so you can identify and fix mistakes.
Which textbook covers Checking Arithmetic with Inverses?
Checking Arithmetic with Inverses is covered in Saxon Math, Course 3, specifically in Chapter 1: Number & Operations • Measurement under Lesson 2: Operations of Arithmetic. Pengi's lesson is aligned directly to this textbook so you can follow along with your class.
Is Checking Arithmetic with Inverses free to study on Pengi?
Yes, the core Learn and Practice modes for Checking Arithmetic with Inverses are available for free on Pengi. No credit card is required to start studying.