Addition Within 100
1st Grade • Half Day Lesson Plan
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Quick Facts
Subject: Math, Numbers and Operations in Base Ten
Type: Half Day Lesson Plan
CCSS: 1.NBT.2, 1.NBT.4
Skills: Place value, understand 2 digits of a 2-digit number represent amounts of tens and ones, addition within 100, 2-digit plus 1 digit, 2-digit plus multiple of 10
File Type: PDF Document
Materials Needed: pencils, student whiteboards, eraser, dry erase markers, base ten blocks for each student (9 tens and 18 ones), scissors and glue, markers, crayons, or colored pencils, dice, large construction paper (1 per student) (1 for demonstration), and a document camera or whiteboard
Printable Resources: Required Printable Resources: “Place Value Mat” (1 copy per student) (1 copy for display), “To Regroup or not to Regroup” (1 copy per student) (1 copy for display), "Donut Craft” (1 copy per student) (1 copy for display), Optional Printable Student Resources: “Exit Slips” (as an optional assessment component) (1 copy per student), “Doughnut Craft Example” (1 copy for display)
Lesson Plan Description
This half day lesson plan is broken down into 2 separate segments (60 minutes each) addressing Numbers in Base-Ten: Addition within 100 (1.NBT.4). These lessons include: key place value vocabulary, guided and independent practice of concepts, and participate in a craft to reinforce the concept of addition within 100.
- Segment 1: students will add 2-digit plus 1 digit, 2-digit plus multiple of 10, explain their reasoning on why they had to regroup when adding, and use drawings or base 10 blocks to represent their addition problem.
- Segment 2: students will add 2-digit plus multiple of 10 and create a donut craft representing tens and ones in an addition problem.
These lessons can be taught over the span of a half day or you can use the lessons independently, broken up over several days.