Composition of 100 in 50s, 25s and 20s
Lesson details
Learning outcome
I can compose 100 in 50s, 25s and 20s.
Key learning points
- 100 can be divided into equal parts
- There are two 50s in 100
- There are four 25s in 100
- There are five 20s in 100
Keywords
Compose - You can compose larger numbers from smaller numbers.
Decompose - You can decompose whole numbers into smaller numbers.
Common misconception
Pupils may believe only multiples of 10 can compose 100 and therefore do not see four groups of 25.
Focus on practical representations e.g. bead strings and base 10 blocks where 100 can be composed and decomposed.
Teacher tip
Multiplication equations are used to represent compositions of 100. Take time to connect these to arrays, repeated addition and ways of saying multiplication including groups of.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What numeral represents one hundred?
Q2.Which expression is equivalent to 10?
Q3.Match the equivalent amounts.
80
30
100
70
50
Q4.100 = x 1
Q5.Which equation is equal to 100?
Q6.If 100 decomposed into ten equal parts there will be in each part.
Assessment exit quiz
6 Questions
Q1.How many tens is 100 composed of?
Q2.100 can be decomposed into how many tens?
Q3.Complete the equation: 50 × = 100
Q4.100 can be composed of 4 equal parts. How many ones are in each part?
Q5.One hundred is composed of five equal parts. How many ones are in each part?
Q6.Complete the calculation: 100 = 25 x
To help you plan your 3 maths lesson on: Composition of 100 in 50s, 25s and 20s, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 3 maths lesson on: Composition of 100 in 50s, 25s and 20s, 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 2 maths lessons from the Securing place value to 100 and applying to addition and subtraction unit, dive into the full primary maths curriculum, or learn more about lesson planning.