Use knowledge of addition facts within 10 to add within 20
Lesson details
Learning outcome
I can use knowledge of addition facts within 10 to add within 20
Key learning points
- Addition facts within ten can be applied to addition within 20, e.g. if 3 + 2 is equal to 5 then 13 + 2 is equal to 15
- A number line can be used to show the link between addition of one-digit numbers and teen numbers
Keywords
Addition - Bringing two or more numbers or things together to make a new total.
Add - Bringing two or more numbers or things together to make a new total.
Plus - A synonym for add, represented by the symbol +
Common misconception
Children may rely on counting strategies instead of using known facts to add larger numbers.
Make comparisons between addition within 10 and within 20, looking for patterns. Make sure children notice that the ones digit stays the same when we add numbers with the same ones digits such as 3 + 2 and 13 + 2.
Teacher tip
Use number lines to show addition within 10 and within 20, drawing out the similarities. Make sure children notice that the ones digit stays the same when we add numbers with the same ones digits.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What is the missing part?
Q2.What is the sum of the parts in this picture?
Q3.Which equation represents this part-part-whole model?
Q4.I have 7 pencils altogether. 3 are red and 4 are yellow. Which equations would represent this?
Q5.What does the 2 represent in this equation? 2 + 8 = 10
Q6.Use the number patterns in the equations to find the missing addend in the last equation.
4 + 0 = 4
3 + 1 = 4
2 + 2 = 4
1 + = 4
Assessment exit quiz
6 Questions
Q1.Which of these part-part-whole models match the story?
First Izzy ate 11 strawberries and then she ate 5 more. How many strawberries has she eaten?
Q2.Which equation below helps you to find the answer to 13 + 6 = ___?
Q3.Complete the sentence: 1 plus 7 is equal to 8, so 11 plus 7 is equal to
Q4.Complete the sentence: 6 plus 3 is equal to 9, so 16 plus 3 is equal to
Q5.First, Izzy collected 12 stones and then she found 6 more. How many stones does she have now? stones
Q6.First, Andeep had 11 stickers and then Izzy gave him 5 more. How many stickers does Andeep have now? stickers
To help you plan your 1 maths lesson on: Use knowledge of addition facts within 10 to add within 20, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 1 maths lesson on: Use knowledge of addition facts within 10 to add within 20, 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 Composition of numbers 11 to 19 unit, dive into the full primary maths curriculum, or learn more about lesson planning.