Use knowledge of addition and subtraction facts within 10 to add and subtract within 20
Lesson details
Learning outcome
I can use knowledge of addition and subtraction facts within 10 to add and subtract within 20
Key learning points
- Addition facts within ten can be applied to addition within 20
- Subtraction facts within ten can be applied to subtraction within 20
- If 3 + 2 is equal to 5 then 13 + 2 is equal to 15
- If 5 - 2 is equal to 3 then 15 - 2 is equal to 13
Keywords
Addition - To find the total, or sum, by combining two or more parts (addends), or to increase an amount by adding another.
Subtraction - To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.
Plus - A synonym for add, represented by the symbol +
Minus - A synonym for add, represented by the symbol -
Common misconception
Children may rely on counting strategies instead of using known facts to add or subtract from larger numbers.
Make comparisons between addition and subtraction within 10 and within 20, looking for patterns. Make sure children notice that the ones digit stays the same when we add and subtract numbers with the same ones digits such as 5 - 2 and 15 - 2
Teacher tip
Use number lines to show addition and subtraction within 10 and within 20, drawing out the similarities. Make sure children notice that the ones digit stays the same when we add or subtract numbers with the same ones digits. Use the inverse relationship to check.
Licence
except where otherwise stated. See Oak's terms & conditions (Collection 2).Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Complete the sentence: 2 plus 7 is equal to 9, so 12 plus 7 is equal to
Q2.Complete the sentence: 8 minus 3 is equal to 5, so 18 minus 3 is equal to
Q3.First, Izzy collected 13 stones and then she found 5 more. How many stones does she have now? stones
Q4.First, Izzy had 19 stickers and then she gave Sofia 7 stickers. How many stickers does Izzy have now? stickers
Q5.Tick the correct examples.
Q6.Which symbol should go between 7 and 9 to show that 9 is greater than 7? 7 ___ 9
Assessment exit quiz
6 Questions
Q1.Which symbol goes in between the equations to make this correct?
Q2.Which symbol goes in between the equations to make this correct?
Q3.Which symbol goes in between the equations to make this correct?
Q4.Which equation matches this problem?
Laura and Jacob have 18 pencils. They hand out some and have 5 left. How many did they hand out?
Q5.Use addition or subtraction to solve this problem.
Laura and Jacob have 17 pens. 6 pens are red and the rest are green. How many are green?
Q6.Use addition or subtraction to solve this problem.
Laura has 12 books and Jacob have 8 books. How many books do they have together?
To help you plan your 1 maths lesson on: Use knowledge of addition and subtraction facts within 10 to add and subtract 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 and subtraction facts within 10 to add and subtract 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.