Here are our numbers from 1 to 20, in two rows of ten. They are the top two rows of the hundred square, a big number grid that goes on all the way to 100. What do you notice? What do you wonder?
Our numbers to 20
Every teen sits under its little friend
Find 7 on the top row.
Now look straight down one row: 17. 17 is ten more than 7, so it sits right under 7. We call 7 the little friend of 17.
Here is why. 17 is a full ten and the same 7. That full ten is why 17 sits one row down.
Every teen sits under its little friend. Read the second row with me: ten and one, ten and two, ten and three, all the way to two tens.
Today we explore: listen for a number up to 20, then shade it. One of us shades it on the board. For every teen, everyone says ten and ___, and then we find its little friend straight above it.
We will try 4, then 14, then 9, then 19, then 11, then 20.
Shade the number
In your maths copy, write 3, 6 and 9 in a row, with a space between them.
Under each one, write the teen that sits under it on the square.
Then whisper each teen as ten and some more.
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