Splitting Numbers: Partitioning Two-Digit Numbers
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Splitting Numbers: Partitioning Two-Digit Numbers
Year 1 Mathematics Learning to break numbers into parts
What is Partitioning?
Breaking a number into smaller parts Like splitting a pizza into pieces The parts always add up to the whole number
Let's Start with 10
Count out 10 blocks How many ways can we split them? Try 5 and 5 Try 7 and 3
Two-Digit Numbers
Numbers from 10 to 99 They have tens and ones Like 23 = 20 + 3 We can split them in many ways
Think About 15
How could we split the number 15? What are some different ways?
Ways to Split 15
10 + 5 8 + 7 12 + 3 9 + 6
Your Turn: Split 24
Use blocks or drawings Find at least 3 different ways Write each as an addition sentence
Different Strategies
{"left":"Start with tens and ones\nTry equal parts first","right":"Use doubles (like 12 + 12)\nThink about number facts you know"}
Let's Try 34
30 + 4 (tens and ones) 17 + 17 (equal parts) 20 + 14 25 + 9
Partner Work: Explore 45
Work with a partner Use think boards Find different ways to split 45 Record your addition sentences
What Did You Discover?
Share one way you split 45 Which method was easiest for you? Did you and your partner find the same ways?
Writing Addition Sentences
Every partition makes an addition sentence 15 = 8 + 7 34 = 20 + 14 The equals sign shows they're the same