Add and subtract 10 to and from a 2-digit number.
Lesson details
Learning outcome
I can add and subtract 10 to and from a two-digit number.
Key learning points
- When adding or subtracting 10, the ones digits does not change.
- When adding 10, the tens digit increases by one; when subtracting 10, the tens digit decreases by one.
- When numbers have the same ones digit and the tens digit has a difference of one, they will have a difference of 10
- Understanding the patterns when we add and subtract 10 can help us solve equations efficiently.
Keywords
Efficiently - Not wasting time or effort. An efficient strategy is one we can carry out easily.
Common misconception
Children may focus on the ones digit rather than the tens digits. They may calculate inefficiently by counting on/back in ones rather than using the pattern in the tens digits.
Use Base 10 equipment alongside one hundred squares to support with understanding the structure of adding or subtracting ten and difference. Encourage children to notice what changes and what stays the same.
Teacher tip
Encourage children to search for and use patterns in the digits and to create their own patterns. Orally rehearse stem sentences within this lesson to help children articulate their thinking in full sentences. You may wish to select parts of Task A and B to complete, rather than completing all.
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.Match to complete the sentence.
60
90
70
20
Q2.True or false. The numbers in this sequence are increasing by 10 each time.
Q3.Match so that the second number is 10 more than the first.
38
51
79
92
Q4.Match so that the second number is 10 less than the first.
23
32
46
61
Q5.What is the missing number below?
Q6.Look at the number in the place value chart. 10 less than this number is
Assessment exit quiz
6 Questions
Q1.Adding 10 is the same as finding 10 more. Match the equations to their sums.
44
67
71
98
Q2.Subtracting 10 is the same as finding 10 less. Match the equations to their difference.
25
39
52
87
Q3.10 + 72 =
Q4.89 − 10 =
Q5.Match two numbers that have a difference of 10
45
54
71
27
Q6.54 and ___ have a difference of 10
To help you plan your 2 maths lesson on: Add and subtract 10 to and from a 2-digit number., download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 2 maths lesson on: Add and subtract 10 to and from a 2-digit number., 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 Adding and subtracting ones and tens to and from 2-digit numbers unit, dive into the full primary maths curriculum, or learn more about lesson planning.