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Explain that ten ones make one ten

The equivalence of ten ones and one ten means that ten individual units can be composed into a single unit of a larger place-value unit without changing the quantity; conversely, one ten can be decomposed into ten ones. Within numbers through 100, this relationship explains why ten ones are recorded as 1 ten and 0 ones and supports composing, decomposing, reading, and comparing two-digit numbers.

Detailed Explanation: Explain that ten ones make one ten

Ten ones have the same value as one ten.

Think of 1010 single blocks. We can group them into one group of ten:

10 ones=1 ten10\text{ ones}=1\text{ ten}

Example: Show 1010 ones. How many tens and ones are there?

  1. Count the ones: 1,2,3,…,101,2,3,\ldots,10.
  2. When you have 1010 ones, trade or group them to make 11 ten.
  3. There are no single ones left.

So, 1010 ones is:

1 ten and 0 ones1\text{ ten and }0\text{ ones}

We write this as 1010. The 11 is in the tens place, and the 00 is in the ones place.

Learn by doing: Explain that ten ones make one ten

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    Addition - Whole Number 2 digit + 1 digit - Column, With Carry

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