# Problem solving using the column method

In this lesson, we will learn how to apply our understanding of the column method to finding and fixing errors and completing unfinished column method calculations.

#### 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.Which equation could be used to estimate the answer to: 653 098 - 118 542?

1/5

Q2.Which columns would require regrouping when column subtracting: 563 357 - 325 129?

2/5

Q3.Use the column method to calculate the answer to: 561 998 - 138 422 =

3/5

Q4.Use the column method to calculate the answer to: 183 609 - 21 788 =

4/5

Q5.Why might bar modelling be useful?

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.Which equation could be used to estimate the answer to: 653 098 - 118 542?

1/5

Q2.Which columns would require regrouping when column subtracting: 563 357 - 325 129?

2/5

Q3.Use the column method to calculate the answer to: 561 998 - 138 422 =

3/5

Q4.Use the column method to calculate the answer to: 183 609 - 21 788 =

4/5

Q5.Why might bar modelling be useful?

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:

# Problem solving using the column method

Quiz to be completed following lesson on: 'Problem solving using the column method.'

Q1.Select the equation below that matches this maths story: '87 315 cars were sold over the weekend. 12 872 of these cars were new and the rest were secondhand. How many cars were secondhand?'

1/5

Q2.Describe the error that has been made in the following calculation: 213 876 - 114 689 = 328 565.

2/5

Q3.Write out the following column method calculation and describe the error that has occurred: 562 088 - 134 199 = 432 111.

3/5

Q4.Which of the following methods is NOT a sensible way of checking to see whether we have made an error using the column method?

4/5

Q5.What is the missing number in the following equation: 435 629 + _________ = 772 345

5/5

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

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

# Problem solving using the column method

Quiz to be completed following lesson on: 'Problem solving using the column method.'

Q1.Select the equation below that matches this maths story: '87 315 cars were sold over the weekend. 12 872 of these cars were new and the rest were secondhand. How many cars were secondhand?'

1/5

Q2.Describe the error that has been made in the following calculation: 213 876 - 114 689 = 328 565.

2/5

Q3.Write out the following column method calculation and describe the error that has occurred: 562 088 - 134 199 = 432 111.

3/5

Q4.Which of the following methods is NOT a sensible way of checking to see whether we have made an error using the column method?

4/5

Q5.What is the missing number in the following equation: 435 629 + _________ = 772 345

5/5

# Lesson summary: Problem solving using the column method

## 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:
Chair yoga