# Calculating flexibly

In this lesson, we will learn to estimate using derived facts and then adjust them to calculate the answer. We will then be able to solve a range of problems selecting suitable strategies and giving reasons for our choices.

#### 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 of the following methods for answering a multiplication questions is NOT a mental strategy?

1/5

Q2.Today we discussed distributive law in relation to multiplication. But which of the following number sentences does NOT correctly represent distributive law?

2/5

Q3.Which of the following representations would be efficient for the calculation 317 x 23?

3/5

Q4.For which of these calculations would you consider using a mental strategy and NOT a written method?

4/5

Q5.Which calculation do the dienes represent? 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 of the following methods for answering a multiplication questions is NOT a mental strategy?

1/5

Q2.Today we discussed distributive law in relation to multiplication. But which of the following number sentences does NOT correctly represent distributive law?

2/5

Q3.Which of the following representations would be efficient for the calculation 317 x 23?

3/5

Q4.For which of these calculations would you consider using a mental strategy and NOT a written method?

4/5

Q5.Which calculation do the dienes represent? 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:

# Calculating Flexibly Quiz

What a super learner you are! Being able to estimate and calculate within the same lesson, you deserve a big pat on the back for a job well done! However, our lessons are never over until you have completed the quiz. This will be a great opportunity to see how much of the information has embedded and how confident you will be to calculate flexibly in the future. Good luck.

Q1.Which of the following number sentences would be the most efficient choice to use when estimating 237 x 4

1/4

Q2.Which estimation is correct for the calculation 192 ÷ 8?

2/4

Q3.I rounded a calculation and got the estimated answer of 560. But what was my original sum?

3/4

Q4.Which of the following calculations would provide you with the value indicated on the marked number line after it is rounded to create an estimated answer? 4/4

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

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

# Calculating Flexibly Quiz

What a super learner you are! Being able to estimate and calculate within the same lesson, you deserve a big pat on the back for a job well done! However, our lessons are never over until you have completed the quiz. This will be a great opportunity to see how much of the information has embedded and how confident you will be to calculate flexibly in the future. Good luck.

Q1.Which of the following number sentences would be the most efficient choice to use when estimating 237 x 4

1/4

Q2.Which estimation is correct for the calculation 192 ÷ 8?

2/4

Q3.I rounded a calculation and got the estimated answer of 560. But what was my original sum?

3/4

Q4.Which of the following calculations would provide you with the value indicated on the marked number line after it is rounded to create an estimated answer? 4/4

# Lesson summary: Calculating flexibly

## 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