To find the total, or sum, by combining two or more parts (addends), or to increase an amount by adding another.

To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.

Use knowledge of facts and unitising to add and subtract multiples 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

Which representation matches 4 tens + 1 ten = 5 tens?

so 4 tens plus 2 tens is equal to 6 tens.

so 5 tens plus 3 tens is equal to 8 tens.

so 2 tens plus 5 tens is equal to 7 tens.

Complete the equation 6 tens = 3 tens + {{ }} tens

Which representation could show 6 tens subtract 4 tens is equal to 2 tens?

Alex says, “I know that 7 minus 4 is equal to 3”. Which of the following equations would Alex’s statement help to solve?

Complete the sentence. I know that 6 + 1 = 7 so {{}}.

Complete the sentence. I know that 8 - 1 = 7 so {{}}.

Match the equation to the correct multiple of 10

Jun thinks he has represented 40 + 10 = 50 but he is incorrect. What equation does this represent? 

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