## Math - Common Core Standards

First Grade

## Number and Operations in Base Ten

## Extend the Counting Sequence

1.NBT.1. Count to 120,
starting at any number less than 120. In this
range, read and write numerals and represent a
number of objects with a written numeral.

## Understand Place Value

1.NBT.2. Understand that the
two digits of a two-digit number represent amounts
of tens and ones. Understand the following as
special cases:

- 10 can be thought of as a bundle of ten ones
— called a “ten.”
- The numbers from 11 to 19 are composed of a
ten and one, two, three, four, five, six, seven,
eight, or nine ones.
- The numbers 10, 20, 30, 40, 50, 60, 70, 80,
90 refer to one, two, three, four, five, six,
seven, eight, or nine tens (and 0 ones).

1.NBT.3. Compare two two-digit numbers
based on meanings of the tens and ones digits, recording the
results of comparisons with the symbols >, =, and <.

## Use place value understanding and properties of operations to
add and subtract

- 1.NBT.4. Add within 100, including
adding a two-digit number and a one-digit number, and adding a
two-digit number and a multiple of 10, using concrete models or
drawings and strategies based on place value, properties of
operations, and/or the relationship between addition and
subtraction; relate the strategy to a written method and explain
the reasoning used. Understand that in adding two-digit numbers,
one adds tens and tens, ones and ones; and sometimes it is
necessary to compose a ten.

- 1.NBT.5. Given a two-digit number,
mentally find 10 more or 10 less than the number, without having
to count; explain the reasoning used.

- 1.NBT.6. Subtract multiples of 10 in
the range 10-90 from multiples of 10 in the range 10-90
(positive or zero differences), using concrete models or
drawings and strategies based on place value, properties of
operations, and/or the relationship between addition and
subtraction; relate the strategy to a written method and explain
the reasoning used.

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