Skill: Recognize groups of 10

A group of 10 is a group with exactly ten objects. Since $(10)$ ones are the same as $1$ ten, we can organize objects into groups of ten to count more easily.

Example: How many objects are there?

Imagine $(34)$ counters.

1. Make complete groups of $(10)$:

   • $(10)$ counters = $1$ group of ten
   • $(10)$ counters = $1$ group of ten
   • $(10)$ counters = $1$ group of ten

2. Count the counters left over. There are $4$ ones.

3. So, $(34)$ has:

   • $3$ complete groups of ten
   • $4$ leftover ones

We can show this with an equation:

$$34 = 3\text{ tens} + 4\text{ ones}$$

Count the groups by tens:

$$10,\ 20,\ 30$$

Then count the $4$ leftover ones:

$$30 + 4 = 34$$

So, $(34)$ objects are 3 groups of ten and 4 ones.