Deriving addition and subtraction facts by using given calculations

In this lesson, we will derive addition and subtraction facts by using given calculations, consider how the whole or parts have changed and the impact this has on the new calculation.

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

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.If I know 3 + 3 = 6, then I know...

1/5

Q2.If I know 3 + 5 = 8, then I know...

2/5

Q3.What's the missing part in the following equation: 220 + ___ = 550

3/5

Q4.What's the missing part in the following equation: 110 + ___ = 660

4/5

Q5.Here are three derived facts, based on the fact 3 + 5 = 8. Which is incorrect?

5/5

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

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.If I know 3 + 3 = 6, then I know...

1/5

Q2.If I know 3 + 5 = 8, then I know...

2/5

Q3.What's the missing part in the following equation: 220 + ___ = 550

3/5

Q4.What's the missing part in the following equation: 110 + ___ = 660

4/5

Q5.Here are three derived facts, based on the fact 3 + 5 = 8. Which is incorrect?

5/5

Video

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Worksheet

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This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Deriving addition and subtraction facts by using given calculations

Using what we have learnt today, can you answer the following questions?

Q1.What's the same? What's different? 364 + 302 = 666 and 374 + 302 = 676

1/5

Q2.What's the same? What's different? 764 - 204 = 560 and 754 - 204 = 550

2/5

Q3.What's the same? What's different? 3672 + 1474 = 5146 and 3972 + 1474 = 5446

3/5

Q4.If... 362 + 205 = 567 then... 262 + 205 = ?

4/5

Q5.If... 751 - 303 = 448 then... 741 - 303 = ?

5/5

This quiz includes images that don't have any alt text - please contact your teacher who should be able to help you with an audio description.

Quiz:

Deriving addition and subtraction facts by using given calculations

Using what we have learnt today, can you answer the following questions?

Q1.What's the same? What's different? 364 + 302 = 666 and 374 + 302 = 676

1/5

Q2.What's the same? What's different? 764 - 204 = 560 and 754 - 204 = 550

2/5

Q3.What's the same? What's different? 3672 + 1474 = 5146 and 3972 + 1474 = 5446

3/5

Q4.If... 362 + 205 = 567 then... 262 + 205 = ?

4/5

Q5.If... 751 - 303 = 448 then... 741 - 303 = ?

5/5

Lesson summary: Deriving addition and subtraction facts by using given calculations

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