# CCSS.Math.Content.2.NBT.A.1

Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 706 equals 7 hundreds, 0 tens, and 6 ones.

# CCSS.Math.Content.2.NBT.A.2

Count within 1000; skip-count by 5s, 10s, and 100s.

# CCSS.Math.Content.2.NBT.A.3

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

# CCSS.Math.Content.2.NBT.A.4

Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols to record the results of comparisons.

# CCSS.Math.Content.2.NBT.B.5

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

# CCSS.Math.Content.2.NBT.B.6

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

# CCSS.Math.Content.2.NBT.B.7

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.

# CCSS.Math.Content.2.NBT.B.8

Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.

# CCSS.Math.Content.2.NBT.B.9

Explain why addition and subtraction strategies work, using place value and the properties of operations.