Explain what happens when you add and subtract ten to a multiple of ten

Maths

In this unit pupils will represent multiples of ten using numerals and names and and use knowledge of facts and unitising to add and subtract multiples of ten. In the future unit pupils will learn that 100 is composed of ten tens and one hundred ones.  They will learn that 100 is composed of 50s, 25s and 20s. They will use known facts to find multiples of ten that compose 100.

In the prior unit pupils extended their counting to counting the decade numbers and making representations using a variety of different manipulatives. In this unit pupils will represent multiples of ten using numerals and names and and use knowledge of facts and unitising to add and subtract multiples of ten.

Composition of  multiples of 10

Ten more than 40 is 50, so ten less than 50 is {{ }}

Match the equation to the correct multiple of 10

Match the pairs of equations to complete the sentence. I know that {{}} so {{}}

What number comes next in the counting sequence? 30, 40, 50, {{ }}

What number is missing in the counting sequence? 50, 60, {{ }}, 80, 90

What number comes next in the backwards counting sequence? 30, 20, {{ }}

What multiple of 10 is the arrow pointing to on this number line?

Which arrow shows the position of 90 on this number line?

What is a good estimate for this multiple of 10 shown on the number line?

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