Estimating Numbers on Number Lines

Year 1 Mathematics Learning to estimate where numbers go Using the middle number as our guide

WALT - We Are Learning To

Estimate where numbers go on number lines Use the middle number as our starting point Place numbers in the right sections: 10-20, 20-30, 30-40, 40-50 Explain our thinking to friends

Success Criteria - I Can...

Find the middle number on each number line section Decide if my number is closer to the start, middle, or end Place numbers sensibly in the correct range Compare my answer with friends and explain why

Our Number Line Segments

Let's Practice Together!

Look at the number 17 Which number line does it belong on? Find the middle number (15) Is 17 closer to 15 or 20? Let's place it together!

Station Activity Time!

{"left":"Station 1: Numbers 10-20 (Start here for support)\nStation 2: Numbers 20-30 (Good for most children)\nStation 3: Numbers 30-40 (Ready for a challenge)\nStation 4: Numbers 40-50 (For confident mathematicians)","right":"Work with your group\nTake turns placing number cards\nExplain your thinking\nHelp each other learn"}

Think and Discuss

How did using the middle number help you? Which placements were you most confident about? What would you do differently next time? Can you help a friend understand your strategy?

Quick Fire Challenge!

I'll show you a number card Write where you think it goes on your whiteboard Use your middle number strategy 3... 2... 1... Show me!

Remember Our Strategy

"First find the middle number, then decide if your number is closer to the start, middle, or end of the number line!"

Well Done, Number Detectives!

You can now estimate where numbers go on number lines You know how to use the middle number as your guide You can explain your mathematical thinking Keep practicing at home with your number detective skills!