Furthering understanding of subtraction as decreasing an amount
I can compare subtraction as decreasing an amount to other addition and subtraction structures.
Furthering understanding of subtraction as decreasing an amount
I can compare subtraction as decreasing an amount to other addition and subtraction structures.
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Lesson details
Key learning points
- Subtraction can be seen as both partitioning and as decreasing an amount.
- Both types of subtraction stories are represented by the same equation.
- In an addition story, the amount at the start of the story is increased.
- In an subtraction story, the amount at the start of the story is decreased.
Keywords
Subtraction - To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.
Decrease - Make something smaller in size or quantity decrease.
Addition - To find the total, or sum, by combining two or more parts (addends), or to increase an amount by adding another.
Increase - To make something larger/greater in size or quantity.
Common misconception
After exploring reduction, children may struggle to see partitioning as subtraction because a part is not taken away from the whole.
Make strong links between equations and different subtraction contexts by focusing on what the subtrahend represents in each case.
To help you plan your year 1 maths lesson on: Furthering understanding of subtraction as decreasing an amount, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 1 maths lesson on: Furthering understanding of subtraction as decreasing an amount, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.6 - 2 = 4
First, there were 6 apples on the plate.
Then, 2 apples were taken off the plate.
Now, there are 4 apples on the plate.
What does the 2 represent in this story?
Q2.Which story could match this picture?
Q3.Which equation matches this story?
Q4.Which equation matches the story?
Q5.What is the subtrahend in this problem?
Q6.Match the story to the equation it represents.
First, there were 8 cars. Then, 4 drove away. Now, there are 4 cars.
First, there were 5 dogs. Then, 5 ran away. Now, there are 0 dogs.
First, there were 10 birds. Then, 6 flew away. Now, there are 4 birds.
Assessment exit quiz
6 Questions
Q1.A monkey has 7 bananas. She eats 5 of them. How many bananas does she have left?
Q2.Which equation matches this 'First, then, now' story?
Q3.Write an equation to represent this story.
Q4.Is this number line showing an increase or a decrease from the amount at the start of the story?
Q5.Is this story showing an increase or a decrease from the first amount?
Q6.Which of these stories is correct?
