Explain what happens when you add and subtract ten to a multiple of ten
Lesson details
Learning outcome
I can explain what happens when you add and subtract ten to a multiple of ten.
Key learning points
- Ten can be added to or subtracted from a multiple of ten.
- When you add ten to a multiple of ten the tens number increases by one
- When you subtract ten from a multiple of ten the tens number decreases by one
- If 3 + 1 is equal to 4 then 3 tens + 1 ten is equal to 4 tens which is equal to 40
Keywords
Increase - Make something bigger (in size or quantity).
Decrease - Make something smaller (in size or quantity).
Multiple - A multiple is the result of multiplying a number by another whole number.
Common misconception
Children may not see the link between adding ones and adding tens. They may add or subtract one instead of ten or muddle addition and subtraction, so may subtract ten instead of add ten to a number.
Reinforce understanding of unitising by describing each group of objects in ones or tens, e.g. five cubes plus 1 cube, 5 tens plus 1 ten and talk through what is happening. Show this with equipment in tens and ones such as straws or cubes.
Teacher tip
Being able to unitise is fundamental in understanding place value, it allows children to move from additive to multiplicative thinking which will be needed for future work on multiplication and division. When counting and grouping objects, reinforce unitising language e.g. this is 3 groups of ten.
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.What number comes next in the counting sequence? 30, 40, 50,
Q2.What number is missing in the counting sequence? 50, 60, , 80, 90
Q3.What number comes next in the backwards counting sequence? 30, 20,
Q4.What multiple of 10 is the arrow pointing to on this number line?
Q5.Which arrow shows the position of 90 on this number line?
Q6.What is a good estimate for this multiple of 10 shown on the number line?
Assessment exit quiz
6 Questions
Q1.What is the missing number?
Q2.Ten more than 50 is
Q3.Ten more than 40 is 50, so ten less than 50 is
Q4.Match the equation to the correct multiple of 10
50
70
80
10
Q5.Ten less than 70 is
Q6.Match the pairs of equations to complete the sentence. I know that so
30 + 10 = 40
10 + 50 = 60
40 + 10 = 50
60 + 10 = 70
To help you plan your 2 maths lesson on: Explain what happens when you add and subtract ten to a multiple of ten, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your 2 maths lesson on: Explain what happens when you add and subtract ten to a multiple of ten, 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.
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