# Tens & Ones: 10 More, 10 Less

1st Grade • Half Day Lesson Plan## Quick Facts

Subject: Math, Numbers and Operations in Base Ten

Type: Half Day Lesson Plan

CCSS: 1.NBT.2, 1.NBT.5

Skills: Math Numbers and Operations in Base Ten, Add and Subtract 1 and 10, Understand 2 digits of a 2 digit number represent amounts of tens and ones, and use mental math to find 10 less or 10 more than a number without counting.

Materials Needed: Pencils, large class number grid (if not available, display “Student Number Grid” on the document camera), small post it notes to cover numbers on large class number grid, document camera or whiteboard, student whiteboards, eraser, dry erase markers, scissors and brads and paper clips for spinners.

Printable Resources:
**Required Printable Resources:** “Mystery Numbers” (1 copy per student), “+ 10 and -10 Poster” (1 copy for display), “Make Your Own Number Grid Flap” (1 copy per student), “Number Grid Puzzle Cards” (1 copy per pair of students, or if doing centers - 1 copy per pair of students for 1/3 of the class) and “Spin, Add or Subtract 10” (1 copy per pair of students, or if doing centers - 1 copy per pair of students for 1/3 of the class). **Optional Printable Student Resources:** “Exit Slips" (1 copy per student), “Student Number Grid” (1 copy per student) or use classroom set of 100 number grid if available, and “Break Up Your Day” brain/movement break ideas

## Lesson Plan Description

In this fully scripted, 2 segment, 2 hour lesson, 1st grade students will practice understanding that the 2 digits of a 2 digit number represent amounts of tens and ones and mentally find 10 less or 10 more than a number without counting.

In Segment 1, students will look for patterns on a number grid and collaboratively discuss how place value can help find 10 more or 10 less than a number without counting using color-coding on a number grid. Also, they will explain their reasoning on how they find 10 more or 10 less than a number and determine missing numbers by using the 10’s strategy.

In segment 2, playing the game, Spin, Add or Subtract 10 collaboratively in partners, 1st graders will demonstrate their understanding of number sense for this standard.

Each segment has an exit slip that will provide valuable instructional information to you regarding your students understanding of place value for 2 digit numbers as well as the mental math skills that help determine a number without actually counting.