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## General

Students learn to add numbers to 20, without carrying numbers.

## Relevance

It is important that you are able to add numbers to twenty, so you know how many objects you have when two groups of objects are joined.

## Introduction

The interactive whiteboard shows a number line from 0 to 20 with a question mark somewhere on the number line. There are 3 markers with numbers. The students must determine which marker belongs at the question mark. You can ask students how they determine which marker has the correct number.

## Development

To check that students can add up to twenty without carrying numbers, you can ask the following questions:
What do you do if you want to add on the number line?
What do you look at if you want to solve a story problem?
How do you calculate 14+3?

## Guided practice

Students first practice adding two addends to 20 using visual support. Next they get an addition problem without the visual support. Students also get a story problem to solve. Ask students how they solve this type of problem.

## Closing

Repeat the goal of being able to add to 20 and why it is important. On the interactive whiteboard there is a piggy bank with an amount of money and a hand with some money. The students must determine which addition problem matches the image and must calculate the total. You can ask students which method they used and why they like this one best.

## Teaching tips

If students have difficulty with this learning goal, they can be supported by the use of blocks or other manipulatives to use while adding.

## Instruction materials

Blocks or other manipulatives

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