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.
teach addition AND subtraction. However,
we always start with addition first in our classroom.
parents, but is also a reference sheet for teachers.
and without regrouping using a gradual release.
Students begin adding only multiples of tens and gradually work to
adding two digits with grouping.
- How to Add Using an Open Number Line Directions
- Adding Two Addends that are Multiples of Tens with Hints
- Adding Two Addends that are Multiples of Tens Without Hints
- Adding with One Addend being a Multiple of Ten With Hints
- Adding with One Addend being a Multiple of Ten Without Hints
- Adding with Two Digits With Hints
Click here for this great pack of FREE math centers, plus get tips and updates from me!
Mandy Gregory is a 2007 and 2012 Teacher of the Year. She has taught 4th, 3rd, and 2nd grade in both the general education and inclusion setting. She is the owner and creator of the Teaching Tips website (www.mandygregory.com) and has over 10 years of experience. She is married with two beautiful children.