A number has been made from place
value blocks. How many groups of 10 are
there? What is the number?
Let’s count the tens blocks, one,
two, three, four, five, six, seven. There are seven groups of 10. Now we can work out what the number
is. We can count in tens seven times
because there are seven groups of 10, 10, 20, 30, 40, 50, 60, 70.
There are seven groups of 10. And the number is 70.