September 2016 Page 9 of 27
College- and Career-Readiness Standards for Mathematics
Numbers and Operation in Base Ten
Use place value understanding and properties of operations to add and subtract
2.NBT.5
Fluently add and
subtract within 100
using strategies
based on place value,
properties of
operations, and/or the
relationship between
addition and
subtraction.
Desired Student Performance
• Combine for addition.
• Take away for subtraction.
• Use properties of operations.
• Use a hundreds chart.
• Add within 100.
• How to choose the method in
which you will solve a
problem.
• Solve using the traditional
algorithm.
• Use vertical/place value
addition.
• Use horizontal addition.
• Mentally find 10 more and 10
less.
A student should understand
• The place value number
system.
• Adding tens is similar to
adding ones.
• Two-digit numbers can be
broken apart using tens and
ones and added in different
ways.
• Patterns on a hundreds chart.
• Subtracting groups of tens is
similar to subtracting
numbers less than 10.
• Ten ones can be regrouped
for 1 ten.
• One ten can be regrouped for
10 ones.
• Sums and differences can be
found using models, mental
math or paper and pencil.
A student should be able to do
• Identify and write numbers
that are 10 more and 10 less
than given numbers.
• Mentally add a one-digit
number to a two-digit number.
• Use models and algorithms
for addition and subtraction.
• Use mental math to add a
two-digit number to a two-
digit number.
• Find the missing part of
numbers within 100 by
“counting on” from the given
part.
• Regroup 1 ten as 10 ones
when subtracting.
• Regroup 10 ones as a ten.