Common Core Alignment:.

1.NBT.2:

Number And Operations In Base Ten

Understand Place Value.

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

a. 10 can be thought of as a bundle of ten ones - called a "ten."

b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones.

c. 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.2b:

Number And Operations In Base Ten

Understand Place Value.

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:

Number And Operations In Base Ten

Understand Place Value.

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.4:

Number And Operations In Base Ten

Use Place Value Understanding And Properties Of Operations To Add And Subtract.

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.

2.NBT.3:

Number And Operations In Base Ten

Understand Place Value.

Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.

2.NBT.5:

Number And Operations In Base Ten

Use Place Value Understanding And Properties Of Operations To Add And Subtract.

Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

2.NBT.6:

Number And Operations In Base Ten

Use Place Value Understanding And Properties Of Operations To Add And Subtract.

Add up to four two-digit numbers using strategies based on place value and properties of operations.

2.NBT.7:

Number And Operations In Base Ten

Use Place Value Understanding And Properties Of Operations To Add And Subtract.

Add and subtract within 1000, 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. Understand that in adding or subtracting three- digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

3.NBT.2:

Number And Operations In Base Ten

Use Place Value Understanding And Properties Of Operations To Perform Multi-Digit Arithmetic

Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and-or the relationship between addition and subtraction.