# Numeracy observation - estimating

Discussion in 'Primary' started by smarties0483, Jan 22, 2011.

1. ### smarties0483

Hi all,
I have an observation coming up this week in year 1 and year 2 mixed, and I will be doing estimating and counting in groups of 2, 5 and 10. These are my ideas so far, does it sound ok?
MOS: need a fun interactive starter, I&rsquo;m struggling, any ideas?
Main: hopefully (if board is working!) an IWB activity estimating the number of objects the chn can see (initially up to 10), hiding the objects while we estimate, and then counting, moving on to estimating number of objects up to 20. Explain that an estimate just needs to be a good guess. See how the chn count the objects, explain that there is a quicker way &ndash; counting into groups of 2 or 5 or 10. Repeat with examples.
Group work: Lower year 1: estimating objects in different pots up to 20, recording estimate and actual count, count in groups of 2.
Higher year 1: As above but up to 30 objects, counting in groups of 2 and 10.
Year 2: Up to 100 objects for most able, estimating then counting in groups of 10. Extend them to find the difference between their estimate and the actual number, then estimating how many objects it will take to fill half of different containers,
How does this sound? I&rsquo;m concerned that it sounds a bit boring but I&rsquo;m struggling for inspiration a bit on this!
Smarties

up!

4. ### jog_onNew commenter

As you're going to need counting in 2s, 5s and 10s skills in the main and group work, why not link your starter to this?
How about climbing the 10s ladder? Start with hands on the floor and that is 0 - start to climb the invisible ladder counting in 10s as you do. You should reach 100 when your hands are as high as they can be. Then, count back down to 0 (extend MA and HA by doing this). Then hold hands out in front and ask which number this might be and why?
Alternatively, do the activity where you put 2ps/5ps/10ps into a jar behind a screen (so the children can't see) - they should count in 2s/5s/10s when they hear the coin go in.
Hope this helps with the OMS anyway
Good luck!

PS For part of your main, to use reasoning and explaining skills, why not get chn to pick up handfuls of cubes (unifix) and ask other children to estimate how many cubes are in their hands? Why might x have more in his hands than z? (choose tall and short child for this demo). Should get them thinking - you could also join in with the activity - who thinks that I'll have more cubes than John? Why? etc