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.

A multiple of 10 is a number which can be made of groups of ten.

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

Aisha shows an answer on a place value chart. Which equation could she have been answering?

Match the expressions that have the same answer.

What is the missing part in this part-part-whole model?

What is the missing part in this bar model?

What is the missing part in this equation? 70 − {{ }} = 10

so 5 tens plus 4 tens is equal to 9 tens.

so 2 tens plus 3 tens is equal to 5 tens.

Complete the equation. 7 tens = 1 tens + {{ }} tens

Complete the equation. { }} tens + 3 tens = 5 tens

Alex says, “I know that 9 minus 6 is equal to 3”. Which of the following equations would Alex’s statement help to solve?

Order the equations starting with the greatest.

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