Watch the video and then...

 

Play with objects that you can count with your children and help them learn one less! For example, lay out 3 pencils then subtract one and ask how many are left. Ask your child to say the sentence "2 is one less than 3". Repeat with using different amounts and different objects. 

After that have a go at completing one of the worksheets on the pdf file.

Once you have had a go at the worksheet, your child may be able to have a go at the game below!