Composing & Decomposing Number

We've been working really hard to compose and decompose numbers within 10 in the last few weeks. 

Decomposing is subtraction - taking away some to leave just part.

Composing is addition - combining 2 parts to make a whole.

We've also been working to find all the different ways to make a number. Here's our chart of ways to 6 where we combine two numbers to make 6.

We've also been working hard to tell and solve story problems (both composing and decomposing). Mathematicians draw quick pictures (not like artists do) to solve. Then they write a number sentence.

We've been using our strategies like Doubles Facts (5+5=10) to quickly solve problems like:
10 pumpkins were on the porch.
5 pumpkins rotted.
How many pumpkins are left?

Mathematicians would quickly know the answer it 5 because 5+5=10!

Here are some examples.  

Have your amazing mathematician tell you a story problem to solve, or tell them one and have them draw and write the answer!

This week we're working on telling time to the hour & learning the parts of a clock. We'll be solving some story problems about time too! Look for a post on Time soon.