Addition to 10 with three addends

General

Students can add three addends together to a total of 10.

Relevance

It is important to be able to add three or more addends. In some situations, it is required, for example when you do groceries, see groups of animals, or play a game with 3 dice.

Introduction

First practice with addition with 2 addends with visual support.

Development

First discuss the importance of being able to add with 3 addends. Next the learning goal will be explained in visual, abstract, and story forms. You can navigate through the lesson in the menu found in the bottom right of the lesson. If you start at the beginning, you start with visual support of adding with three addends. Explain, using the images as support how to add three addends together. Next discuss how to add with problems without visual support. If you want to help students by making the problem visual, move the cover on the interactive whiteboard. Next repeat the steps of how to solve a story problem. Students can click on the speaker icon to have the story spoken aloud. Make sure that you explain the steps with the students and have students do a few exercises to show their understanding.

Check that students have understood adding to 10 with three addends by asking the following questions:
- Why is it useful to be able to add?
- How do you add an addition problem with three addends together? What do you do first? And then?

Guided practice

First do an addition problem together as a class with visual support. Next is an abstract addition problem without visual support and finally a story problem.

Closing

Repeat the learning goal and ask why it is useful to be able to add multiple addends, and ask students what the first step is in this kind of addition problem. Divide the class into groups of 4 or 5 students and give each group 3 dice. A student throws the dice and calculates how many dots there are. If they throw a number less than ten, they get a point. If the student throws more than 10 they don't need to add to find the total, and the next student gets a turn.