Today we're counting in 2s.
There are many things that come in pairs. A pair is two things together. Think of your socks, they come in 2s or wheels on a bicycle!
If there were 3 bicycles, there would be 2, 4, 6 wheels altogether. It is a quicker way of counting. But can you do it from memory or do you need to use a number line?
Remember, number lines are there to help you.