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

A synonym for subtract, represented by the symbol -

The result of subtracting one number from another. How much one number differs from another.

Use knowledge of subtraction facts within 10 to subtract within 20

Maths

In this unit pupils will explain 11-19 as cardinal and ordinal numbers. They will double and halve numbers 6-9 and use addition and subtraction facts to add and subtract within 20. In the future unit pupils will explore the counting sequence for counting to 100 and beyond and represent the numbers from 20-99 in different ways, including marking the position on a number line. 

In prior learning, pupils will have looked for patterns and relationships in number, spotting connections and talking about what they notice. In this unit pupils will explain 11 to 19 as cardinal and ordinal numbers. They will double and halve the numbers 6 to 9 and use known facts to add and subtract within 20.

Composition of numbers 11 to 19

Which of these part-part-whole models match the story?

First Izzy had 19 strawberries and then she ate 5 of them. How many strawberries does she have left?

Which equation below helps you to find the answer to 13 − 2 = ___?

Complete the sentence: 7 minus 2 is equal to 5, so 17 minus 2 is equal to {{ }}  

Complete the sentence: 6 minus 3 is equal to 3, so 16 minus 3 is equal to {{ }} 

First, Izzy collected 18 stones. 5 stones are grey and the rest are brown. How many stones are brown? {{ }} stones

First, Andeep had 15 stickers and then he gave Izzy 3 stickers. How many stickers does Andeep have now? {{ }} stickers

Andeep has 5 biscuits and eats 3 of them. How many does he have left? Which equation represents this?

Izzy has 12 hair clips. 10 are pink and the rest are blue. How many are blue? {{ }} hair clips

Sofia has 17 hair clips. She loses 7 of them. How many hair clips does she have now? {{ }} hair clips

This lesson will soon be taken down.

Use knowledge of subtraction facts within 10 to subtract within 20

Lesson outcome