# Solving word problems with unknown values

In this lesson, we will answer addition and subtraction word problems which require us to identify the unknown quantity.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
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.We estimate when answering questions to...

1/5

Q2.Bar models help us to...

2/5

Q3.We always need to use column addition or subtraction when answering word problems?

3/5

Q4.Class B won 456 house-points before Christmas. Class D won 106 more. How many did Class D win? Does this question require addition or subtraction to answer it?

4/5

Q5.Edinburgh castle sold 345 tickets for tours on Monday. On Tuesday it sold 109 less. How many tickets were sold on Tuesday?

5/5

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
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.We estimate when answering questions to...

1/5

Q2.Bar models help us to...

2/5

Q3.We always need to use column addition or subtraction when answering word problems?

3/5

Q4.Class B won 456 house-points before Christmas. Class D won 106 more. How many did Class D win? Does this question require addition or subtraction to answer it?

4/5

Q5.Edinburgh castle sold 345 tickets for tours on Monday. On Tuesday it sold 109 less. How many tickets were sold on Tuesday?

5/5

# 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.

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Solving addition and subtraction word problems with unknown values

Let's see what you have learnt about solving word problems today

Q1.Word problems are...

1/5

Q2.Does this bar model show an addition or a subtraction problem?

2/5

Q3.Tia is looking after the neighbour's dogs. The adult dog eats 450 g more than the puppy. If the adult dog eats 875 g how much will the puppy eat? Does this question need addition or subtraction to answer it?

3/5

Q4.Which question would this bar model help to answer?

4/5

Q5.Before the final rounds of races on sports day, the green team had 372 points. They ended up winning the competition with 518 points altogether. How many more points did they make in the final round?

5/5

#### Unit quizzes are being retired in August 2023

Why we're removing unit quizzes from the website >
Quiz:

# Solving addition and subtraction word problems with unknown values

Let's see what you have learnt about solving word problems today

Q1.Word problems are...

1/5

Q2.Does this bar model show an addition or a subtraction problem?

2/5

Q3.Tia is looking after the neighbour's dogs. The adult dog eats 450 g more than the puppy. If the adult dog eats 875 g how much will the puppy eat? Does this question need addition or subtraction to answer it?

3/5

Q4.Which question would this bar model help to answer?

4/5

Q5.Before the final rounds of races on sports day, the green team had 372 points. They ended up winning the competition with 518 points altogether. How many more points did they make in the final round?

5/5

# Lesson summary: Solving word problems with unknown values

## Time to move!

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

For 5 mins...

Move around:
Walk

On the spot:
Chair yoga