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COMMON CORE STATE STANDARDS

ACROSS THE GRADES

Kindergarten Grade One Grade Two

Number & Operations in Number & Operations in Base Ten Number & Operations in
Base Ten Base Ten
1.NBT.C.4 Add within 100, including adding a two-
K.NBT.A.1 Compose and digit number and a one-digit number, 2.NBT.B.5 Fluently add and
decompose numbers and adding a two-digit number and a subtract within 100
from 11 to 19 into multiple of 10, using concrete models or using strategies
ten ones and some drawings and strategies based on place based on place
further ones, e.g., value, properties of operations, and/ value, properties of
by using objects or or the relationship between addition operations, and/
drawings, and record and subtraction; relate the strategy or the relationship
each composition to a written method and explain the between addition
or decomposition reasoning used. Understand that in and subtraction.
by a drawing or adding two-digit numbers, one adds
equation (e.g., 18 = tens and tens, ones and ones; and 2.NBT.B.8 Mentally add 10
10 + 8); understand sometimes it is necessary to compose a or 100 to a given
that these numbers ten. number 100–900, and
are composed of ten mentally subtract 10
ones and one, two, 1.NBT.C.5 Given a two-digit number, mentally or 100 from a given
three, four, five, six, find 10 more or 10 less than the number, number 100–900.
seven, eight, or nine without having to count; explain the
ones. reasoning used. 2.NBT.B.9 Explain why addition
and subtraction
Operations and Algebraic 1.NBT.C.6 Subtract multiples of 10 in the range strategies work,
Thinking 10-90 from multiples of 10 in the range using place value
10-90 (positive or zero differences), and the properties
K.OA.A.4 For any number using concrete models or drawings of operations.
from 1 to 9, find the and strategies based on place value, (Explanations may
number that makes properties of operations, and/or the be supported by
10 when added to relationship between addition and drawings or objects.)
the given number, subtraction; relate the strategy to
e.g., by using objects a written method and explain the
or drawings, and reasoning used.
record the answer
with a drawing or
equation.

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