# Exploring problems involving addition and subtraction

In this lesson, we will problem solve to complete missing number triangles! We will practice adding and subtracting to find the answers.

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.This part whole model can be expressed as 7 - 3 = 4. Choose the other subtraction equation that can be written from this part whole model.

1/3

Q2.There are five elves standing up, and two elves sitting down. Altogether, there are seven elves. This can be written as an equation: 5 + 2 = 7. How else can this equation be written?

2/3

Q3.This part whole model can be expressed as 1 + 6 = 7. Choose the other addition equation that can be written from this part whole model.

3/3

Quiz:

# Intro quiz - Recap from previous lesson

Before we start this lesson, let’s see what you can remember from this topic. Here’s a quick quiz!

Q1.This part whole model can be expressed as 7 - 3 = 4. Choose the other subtraction equation that can be written from this part whole model.

1/3

Q2.There are five elves standing up, and two elves sitting down. Altogether, there are seven elves. This can be written as an equation: 5 + 2 = 7. How else can this equation be written?

2/3

Q3.This part whole model can be expressed as 1 + 6 = 7. Choose the other addition equation that can be written from this part whole model.

3/3

# Video

Click on the play button to start the video. If your teacher asks you to pause the video and look at the worksheet you should:

• Click "Close Video"
• Click "Next" to view the activity

Your video will re-appear on the next page, and will stay paused in the right place.

# Worksheet

These slides will take you through some tasks for the lesson. If you need to re-play the video, click the ‘Resume Video’ icon. If you are asked to add answers to the slides, first download or print out the worksheet. Once you have finished all the tasks, click ‘Next’ below.

# Lesson summary: Exploring problems involving addition and subtraction

## Time to move!

Did you know that exercise helps your concentration and ability to learn?

For 5 mins...

Move around:
Climb stairs

On the spot:
Dance