Identify groups of ten and ones

Whole numbers through 99 can be interpreted as groups of ten and remaining ones: ten ones make one ten, and a numeral’s tens digit tells how many groups of ten while its ones digit tells how many individual units remain, including zero ones. Ten-frames, base-ten representations, and numerals make this unit structure visible and support composing and decomposing numbers; larger place-value units and numbers beyond 99 are not included.

Detailed Explanation: Identify groups of ten and ones

A whole number can be made of groups of ten and ones left over.

The tens digit tells how many groups of ten.
The ones digit tells how many individual ones.

Example: How many tens and ones are in $(36)$ ?

Look at the tens digit:
In $(36)$ , the tens digit is $3$ .
So, there are 3 groups of ten.
Look at the ones digit:
The ones digit is $6$ .
So, there are 6 ones.
Put the parts together:

36 = 3\text{ tens} + 6\text{ ones}

So, $(36)$ has 3 tens and 6 ones.

Learn by doing: Identify groups of ten and ones

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Base 10 Blocks - Counting - Picture to Number - Tens and Ones

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