Subtraction finds a missing part
Use addition to understand a subtraction.
Explore this lesson →6 practice questions · Optional read aloud · Thinking pad
Let’s understand the idea.
- The whole has a known part and a missing part.
- To find 13 take away 8, ask what goes with 8 to make 13.
- Eight and five make thirteen, so thirteen take away eight is five.
Try it. Change it. Explain it.
Open the lesson to use its pictures and controls. In How it works, connect the picture to the idea. In Play & discover, change the quantities and notice what stays the same. In Your turn, answer questions and use the explanation to check your reasoning.
You can ask for help, draw on the thinking pad, or listen to the question and answer options. Progress distinguishes independent work from work completed with help.
Let’s try it →Curriculum connection
Grade 1 · 1.OA · US Common Core
This lesson is mapped to these standards. A completed activity is practice evidence, not a claim of mastery. Content is checked against the linked official standards and its mathematical models are tested.