 # Addition to 100 with tens

Start a free 14-day trial. 8,000 schools use Gynzy 92,000 teachers use Gynzy 1,600,000 students use Gynzy

## General

Students learn to add numbers to 100 with tens.

2.NBT.B.5
2.OA.A.1

## Relevance

Discuss with students that it is important to be able to add numbers to 100, so you know how much you have together.

## Introduction

Show students the hands on the interactive whiteboard and ask if they can determine the addition problem shown by the hands. Tell students that it is an addition problem using the zero rule. Ask two students to come to the front of the class and create an addition problem using the zero rule as well. The class must guess what the addition problem is that the students are showing.

## Development

Check that students can add to 100 with tens by asking the following questions:
- What do you look at when you want to solve a story problem?
- How do you calculate 58+20 and 30+10?

## Guided practice

Students first practice adding to 100 with visual support. Next they are given the addition problem without visual support, and finally they are given a story problem to solve.

## Closing

Discuss with students that it is important to be able to add to 100, so they can solve addition problems and determine amounts. Show a few images on the interactive whiteboard and ask students which addition problems match the images. Have students then solve the problems. Finally ask students to come up with story problems in pairs to match the numbers given on the board. Ask them to solve the story problems.

## Teaching tips

If students have trouble adding to 100, they can use the number line as support. 