Take away whole tens
Subtract multiples of ten and relate the bundles to the written calculation.
Explore this lesson →6 practice questions · Optional read aloud · Thinking pad
Let’s understand the idea.
- Count the complete tens you start with.
- Remove the requested number of tens. Each removed ten has value ten ones.
- Seventy take away thirty is seven tens take away three tens: four tens, or 40.
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.NBT · 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.