We are up to our elbows in addition AND subtraction.  According to the new Common Core Standards the traditional algorithm is a fourth grade standard (CCSS.Math.Content.4.NBT.B.4 Fluently add and subtract multi-digit whole numbers using the standard algorithm.). We wanted to make sure we offered students SEVERAL strategies for addition and subtraction so that the algorithm actually makes SENSE rather than becomes a rote task with no meaning.

One strategy we using to teach addition is the open number line.  This is a great strategy that transfers REALLY well to subtraction. The difference between an open number line and a closed number line is that an open number line has no numbers on it- students create and write the number line starting and ending at whatever number they need.

Parents are often VERY confused at all this “new-fangled” math as it is very different from what we learned as children. I created this handout to help teach parents.

It is part of a  “How to Add on an Open Number Line” pack I created. The pages gradual teach adding with the open number line using multiples of 10 nad then moving on to adding with regrouping.

The description of this product is:
The open number line is a wonderful way to
This packet includes “how to directions” on page 4 for
parents, but is also a reference sheet for teachers.
This packet gives students practice adding two digits with
and without regrouping using a gradual release.
This packet includes:
• How to Add Using an Open Number Line Directions