# Using round and adjust strategies to subtract and add near doubles

In this lesson, we will use round and adjust strategies to subtract and add near doubles. We will partition two digit numbers in order to make calculations easier.

# Video

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• Click "Close Video"
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# 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:

# Using round and adjust strategies to add and subtract near doubles

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.Using round and adjust and mental strategies, 34 + 35 =

1/5

Q2.Using round and adjust and mental strategies, 42+ 46 =

2/5

Q3.Using round and adjust and mental strategies, 29 + 28 =

3/5

Q4.Using round and adjust and mental strategies, 35 + 39=

4/5

Q5.Using round and adjust and mental strategies, 49 + 47 =

5/5

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

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

# Using round and adjust strategies to add and subtract near doubles

Don’t worry if you get a question wrong! Forgetting is an important step in learning. We will recap next lesson.

Q1.Using round and adjust and mental strategies, 34 + 35 =

1/5

Q2.Using round and adjust and mental strategies, 42+ 46 =

2/5

Q3.Using round and adjust and mental strategies, 29 + 28 =

3/5

Q4.Using round and adjust and mental strategies, 35 + 39=

4/5

Q5.Using round and adjust and mental strategies, 49 + 47 =

5/5

# Lesson summary: Using round and adjust strategies to subtract and add near doubles

## Time to move!

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For 5 mins...

Move around:
Climb stairs

On the spot:
Dance