Enfield Public Schools
Grade 2 Unit 1 Snapshot
Addition and Subtraction Strategies to 20
Understanding the various strategies that support fact fluency is the
major focus of Unit 1.
For about 2 weeks, students will work on:
 developing fluency* with addition and subtraction facts to 20.
 analyzing and applying various strategies and properties of numbers used in
solving addition and subtraction facts.
 solving problems with 2 or more addends.
 explaining strategies used in problem solving.
*Strategies for developing understandings about number that support automaticity with facts
are introduced at the beginning of the year. The expectation is that students will be fluent
with all of their addition and subtraction facts, within 20, by spring of Grade 2.
>
8 + 6 = ___
2 + 4
I know that 6 is the same as 2 + 4.
I used the 2 with the 8 to make a ten.
4 more than 10 is fourteen.
8 + 6 = 14
Vocabulary students will focus on in Unit 1:
add, subtract, sum, difference, equals, doubles, strategy
Websites that Support Fact Fluency Development: Mathwire.com and Factmonster.com
CtCore Standards we are working on in Unit 1: 2.OA.1, 2.OA.2, 2.NBT.9.
For more information on these CtCore Standards for Mathematics go to: http://ctcorestandards.org/
2015
Diana L. Labich, K-5 Mathematics Department Chair, [email protected]
Enfield Public Schools
Grade 2 Unit 1 Snapshot
Some student work you may see in Unit 1:
Applying Various
Strategies
Properties of Addition
Choose one of the
strategies below to
solve 7 + 8 = ____.
Explain your thinking.
Sue said she can find the sum using the
equation 4 + 5 = ___.
 Doubles plus 1
 Doubles minus 1
 Making a ten

Who will find the correct sum? How do you know?
Sue and Sam had 4 green apples and 5 red apples.
Sam says he will use 5 + 4 = ___.
Understanding the Relationship
between Addition and Subtraction
Fact Families
Write the related
addition and
subtraction facts.
How can knowing that 5 + 7 = 12
help me solve 12 – 5 = _____?
7 + 4 = 11
__ + __ = __
__ - __ = __
__ - __ = __
Solving Problems with Unknowns in All Positions
Use the number line to help you solve.
6 + ____ = 13
NOTE: The development of understandings that lead to fact fluency began with Facts to 5 in K,
continued with Facts to 10 in Gr 1 and culminates in Gr 2 with Facts to 20. Students will do some
timed practice and assessment of math facts throughout the year. Rote practice only accounts for a
small portion of the instruction used to help children become fluent with their addition and
subtraction facts to 20. For more information see the EPS Parent’s Guide to Fact Fluency posted on The
Forum at http://www.enfieldtheforum.org/.
To Access all EPS Mathematics Curriculum Documents go to http://www.enfieldtheforum.org/
Curriculum Tab → PK-5 → Mathematics → then choose your student’s grade level
2015
Diana L. Labich, K-5 Mathematics Department Chair, [email protected]