Partition a whole into two parts and write as a subtraction equation
Lesson details
Learning outcome
I can partition a whole into two parts and express this as a subtraction equation.
Key learning points
- When the whole and one part of the whole is known, subtraction can be used to find the missing part.
- This can be represented with a subtraction equation.
- The minus sign can be used to show that one part has been split or separated from the whole group.
Keywords
Subtract - To separate or take away one number from another, or to decrease an amount.
Minus sign - The symbol in an equation which shows that a number has been partitioned, taken away or decreased.
Partition - The act of splitting an object or value down into smaller parts.
Known part - A piece or section of the whole that is known.
Unknown part - A piece or section of the whole that is not known.
Common misconception
Children may forget to start with the whole group when writing subtraction equations.
Maintain a strong focus throughout on what the numbers in equations represent. Explore mistakes that are made to clarify understanding.
Teacher tip
This lesson teaches the partitioning structure of subtraction. It is important not to refer to subtract as 'taking away' in this context. Stress the link between the abstract and concrete by highlighting what each number in an equation represents.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Izzy has 10 cubes altogether. How many are hidden under the pot? Complete the equation to show how many are hiding under the pot. 8 +___= 10
Q2.Match the equation to the correct addend to complete the equation correctly.
3
1
9
Q3.Use the number pattern to fill in the missing part.
Q4.Jun wants to balance these scales so both sides are equal. What number will he have to write in the triangle?
Q5.Izzy has 8 pennies altogether. She has 2 in one pocket. Complete the equation to show how many she has in the other pocket? _ + 2 = 8
Q6.5 birds are on the branch and the rest are hidden. There are fewer than 7 birds altogether. Which of these numbers must be the missing part? _ + 5
Assessment exit quiz
6 Questions
Q1.Look at the picture. How many dogs are to be subtracted from the whole?
Q2.Use the picture to complete the equation 7 – 3 = _
Q3.There are 8 teddies. 2 belong to Izzy, and 6 do not belong to Izzy. Which pictures could represent this story?
Q4.Which picture shows a whole of 6?
Q5.Look at the picture and say whether the following is true or false. 2 is the whole.
Q6.Which equation represents this picture?
To help you plan your 1 maths lesson on: Partition a whole into two parts and write as a subtraction equation, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 1 maths lesson on: Partition a whole into two parts and write as a subtraction equation, 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.
We use learning cycles to break down learning into key concepts or ideas linked to the learning outcome. Each learning cycle features explanations with checks for understanding and practice tasks with feedback. All of this is found in our slide decks, ready for you to download and edit. The practice tasks are also available as printable worksheets and some lessons have additional materials with extra material you might need for teaching the lesson.
The assessment exit quiz will test your pupils' understanding of the key learning points.
Our video is a tool for planning, showing how other teachers might teach the lesson, offering helpful tips, modelled explanations and inspiration for your own delivery in the classroom. Plus, you can set it as homework or revision for pupils and keep their learning on track by sharing an online pupil version of this lesson.
Explore more key stage 1 maths lessons from the Additive structures: addition unit, dive into the full primary maths curriculum, or learn more about lesson planning.