Day 17 · September 17, 2026
An app to practice rounding numbers with number lines
DAY 17 of building a free app for a teacher every single day!! Today, we build a number rounding practice app for Nancie’s third grades!
Check it out at lines.teacher.dev
The full app
Rounding with Number Lines
Guided rounding practice that helps students use number lines to find endpoints, midpoints, and nearest values.
See the app →