Making Number Combinations to 20
Year 1 Mathematics NSW Curriculum Learning to add and combine numbers
WALT (We Are Learning To)
Create combinations of two numbers that add to 20 Use different strategies to solve addition problems Recognise patterns in number combinations Use mathematical language correctly
Success Criteria
I can find different ways to make the same number I can use words like 'add', 'plus', 'equals' I can explain if a number is greater than or less than another I can show my thinking with pictures and numbers
What Do We Already Know?
Think about combinations to make 10 Share one way you know to make 10 Use your fingers or draw pictures to show your thinking
I Do: Making 8 Different Ways
Watch me find all the ways to make 8 2 + 6 = 8 (I can count on) 4 + 4 = 8 (That's a double!) 10 - 2 = 8 (I know friends of 10) 8 is 2 less than 10
Mathematical Language
8 is 2 greater than 6 8 is 2 less than 10 8 is double 4 4 groups of 2 makes 8
We Do: Finding Ways to Make 6
Work together to find all combinations for 6 Use blocks, drawings, or counting Write number sentences for each way Can you find the 'turn around' facts?
Think and Share
What patterns do you notice in our number combinations? Which strategy helps you most? Can you think of another way to make 6?
You Do: Independent Practice
Choose a number between 11-15 Find as many ways as possible to make your number Draw pictures and write number sentences Use the sentence stems to describe your combinations
What Have We Learned?
We can make the same number in different ways Mathematical language helps us describe our thinking Patterns help us remember number facts These strategies will help us solve problems quickly