When things are grouped in tens, we can count them easily going up in 10s.
There are 10 candles on each cake. How many candles are there altogether?
We could count each candle, one at a time, but that would take forever!
A much better way is to count them in groups of 10, as you can see below: 10, 20, 30, 40, 50.
There are 50 candles here.
How about if you wanted to know how many fingers were being waved in the air by 6 people?
How many fingers does each person have on their hands (if we include the thumbs!) They have 10, of course.
So, we count up in 10s until we've counted 6 people: 10, 20, 30, 40, 50, 60.
So, there are 60 fingers being waved in the air!!
Shall we try some questions now?