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Grade 1: Number and Operation in base ten

1.NBT.1
 Count to 120
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. 
1.NBT.2a
 Understand 10 as a bundle of 10 ones
10 can be thought of as a bundle of ten ones  called a "ten." 
1.NBT.2b
 Understand 11 to 19 are composed of a ten and numbers 1 through 9
The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones. 
1.NBT.2c
 Compare Tens and 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 Numbers
Compare two twodigit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <. 
1.NBT.4
 Add with in 100
Add within 100, including adding a twodigit number and a onedigit number, and adding a twodigit 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 twodigit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten. Add two digit number and a one digit number
 Add two digit number and a two digit number
 Add a onedigit number to a twodigit number  with regrouping
 Add two digit number and a two digit number  with regrouping
 Add a onedigit number to a twodigit number  using models
 Add a twodigit number to a twodigit number  using models
 Adding a twodigit number and a multiple of 10
 Add with in 100  Explain the reasoning used
 Add with in 100  word problems
 Add and subtract tens and

1.NBT.5
 Finding 10 More or Less
Given a twodigit 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
Subtract multiples of 10 in the range 1090 from multiples of 10 in the range 1090 (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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