Estimating Numbers: Clever Guesses to 50
Year 1 Mathematics Learning to make clever guesses about numbers up to 50
WALT: We Are Learning To...
Estimate quantities of objects up to 50 Make sensible guesses about numbers Check our estimates by counting Explain if our guess is too high or too low
Success Criteria
I can make a sensible guess about objects up to 50 I can explain if my estimate is too high or too low I can check my estimate by counting I can compare estimates and say which is closer
What is Estimation?
A clever guess about how many things are there We don't count every single one We use our eyes and brain to guess Then we check by counting!
Our Number Line Helper
Numbers from 0 to 50 Important landmarks: 10, 25, 50 Helps us make better guesses Is our estimate closer to 10 or 30?
Estimation Stations Activity
Visit 3 different estimation jars Write your guess on whiteboard Explain why you chose that number Count to check your estimate Compare with friends' guesses
Differentiation Support
{"left":"Support: Smaller quantities (under 30)\nSupport: Work with a buddy\nSupport: Group objects in tens","right":"Challenge: Very close numbers (42, 45, 48)\nChallenge: Explain reasoning in detail\nChallenge: Compare multiple estimates"}
Group Discussion Time
Which estimates were closest? How did you decide your estimate? Why is estimation useful in real life? What strategies worked best?
Quick Fire Estimation Challenge
Teacher shows objects quickly Write estimate on whiteboard Count together to check Celebrate closest guesses! Practice makes perfect!
Reflection and Next Steps
We learned to make clever guesses about numbers up to 50 We can check our estimates by counting We can explain if our guess is high or low Extension: Find objects at home to estimate and count