Khan Academy
Khan Academy: Add Within 1000
Practice adding three-digit numbers. All sums are 1000 or less. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video tutorial, and ask for hints.
Khan Academy
Khan Academy: Addition Within 1000
In this exercise, students practice addition within 1000. Students receive immediate feedback and have the opportunity to get hints, watch a video tutorial, and try questions repeatedly. CCSS.Math.Content.3.NBT.A.2 Fluently add and...