 Addition to 20 making tens on the number line

# Addition to 20 making tens on the number line

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## General

Students learn to add to 20 on the number line, and they learn to make tens to simplify their addition.

## Introduction

The interactive whiteboard shows a number of addition problems, whose answer is always ten. One of the numbers in the problem is hidden by a paint splatter. Students determine which numbers are needed to compose ten.

## Instruction

To check that students can add to twenty making ten on the number line you can ask the following questions:
- Which number do we look at in an addition problem to determine the number we start at on the number line?
- Which number do we look at in an addition problem to determine how far we move on the number line?
- What is a useful first step?
- How do you know what the answer is?

## Quiz

Students first practice addition on the number line with a complete number line from one to ten. Next, they see a blank number line, but the steps are shown, and finally students must determine the steps to take and the total.

## Closing

Repeat the importance of being able to add to 20 making tens on the number line. The interactive whiteboard shows three different addition problems and three number lines. Students must match the number lines to the addition problems. Ask students how they determined their answer. Remind that they first must look at the first addend to determine where they start on the number line. You can also have the students solve for the total.

## Teaching tips

If students have difficulty with this goal, it is important that they refresh the number line to 20. Also, they must be comfortable composing 10 from all numbers. You can have students practice by giving them number cards from 1 to 9 and having them compose 10 from the card they draw.

## Instruction materials

Optional: number cards to 10

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