Explain what happens when you add and subtract ten to a multiple of ten
I can explain what happens when you add and subtract ten to a multiple of ten.
Explain what happens when you add and subtract ten to a multiple of ten
I can explain what happens when you add and subtract ten to a multiple of ten.
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Lesson details
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.
To help you plan your year 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 year 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.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 1 maths lessons from the Composition of multiples of 10 unit, dive into the full primary maths curriculum, or learn more about lesson planning.
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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