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Watch this Teacher Talk about reading and writing numbers to one hundred.

Here is a place value chart.

Eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen and nineteen aren’t written on the place value chart.

Why do you think they are they missing?

There is a pattern to how the numbers are written from 1 to 100, but we can’t hear a regular pattern in the way we say the numbers until we get to the number 20.

For example, count aloud from 31 to 40 using the number grid below.

The way we say these numbers is the order we write them as digits.

For example, we say 'thirty-one'. We say the tens first, followed by the ones.

Put the arrow cards together to get the number 31 in numerals.

This pattern continues for the numbers to 99. Try counting aloud from 41 to 50 using the grid above. Listen for the order of the tens and ones.

Now look at the numbers highlighted on the grid below. Count aloud from 11 to 20. This time, can you hear the ones first followed by the tens?

The way we say these numbers isn’t the order in which we write them as digits.

For the number sixteen, 'six' is the ones word and 'teen' is the tens word. We say the ones first, then tens.

However, when you write the number in numerals, the tens come before the ones.