This is a PPT I made and used to introduce the concept of finding 'one less' for the first time. The worksheet (with 3 levels of differentiation) is also included. I made this for my EYFS class, but it can also be used for Year 1.
If you follow the PPT, it makes a nice lesson for the children. I teach Maths at the beginning of the day, so I started with some slides discussing the days of the week, names of the months in a year and the weather (the links to the songs I use are on the slides). We also do a 'number of the day' activity each morning, this is also included.
This lesson is based on the song 'Ten Green Bottles'. After singing this song as a class, your children will be able to visualise taking one bottle away each time. As I showed them this, I also wrote the sums and encouraged them to do this on their own whiteboards. Within this lesson, I also showed them the subtraction symbol and encouraged them to make this with their arms and bodies for a multisensory aspect.
I would encourage you to ask your children to go outside and if there is a suitable wall somewhere in your setting, put their bottles on, count them, then take one off each time. This concrete activity is really what helped my children to grasp the objective in this lesson. There are photographs on the PPT for a real life visual example if this is not possible at your setting.
The worksheet asks the children to first count all bottles on a wall, then cross off one bottle each time to find 'one less' There are three options for this; finding one less with numbers to 5, finding one less with numbers to 10 and one for completing the worksheet independently.
I hope you and your class find this lesson helpful and most importantly, enjoyable. Thanks so much for looking :)
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