Number & Operations in Base Ten

Understand place value.

2.NBT.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. Understand the following as special cases:

Represent 3 digit numbers

Represent 3 Digit Numbers

Understanding place value

Understanding Place Value

Expanded forms

Expanded Forms

2.NBT.1.a 100 can be thought of as a bundle of ten tens — called a "hundred."

2.NBT.1.b The numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine hundreds (and 0 tens and 0 ones).

2.NBT.2 Count within 1000; skip-count by 5s, 10s, and 100s.

Count by 2's

Count by 2's

Count by 5's

Count by 5's

Count by 10's

Count by 10's

Count by 100's

Count by 100's

2.NBT.3 Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.

Understanding place value

Understanding Place Value

Expanded forms

Expanded Forms

2.NBT.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.

Compare numbers upto 1000

Compare Numbers upto 1000

Order numbers upto 1000

Order Numbers upto 1000

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

2.NBT.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

2 digit + 1 digit

2 Digit + 1 Digit

2 digit + 2 digit

2 Digit + 2 Digit

2 digit + 1 digit with regrouping

2 Digit + 1 Digit with Regrouping

2 digit + 2 digit with regrouping

2 Digit + 2 Digit with Regrouping

Word problems

Word Problems

Subtract tens from a 2 digit number

Subtract Tens from a 2 Digit Number

2 digit - 1 digit

2 Digit - 1 Digit

2 digit - 2 digit

2 Digit - 2 Digit

2 digit - 1 digit with regrouping

2 Digit - 1 Digit with Regrouping

2 digit - 2 digit with regrouping

2 Digit - 2 Digit with Regrouping

Word problems

Word Problems

2.NBT.6 Add up to four two-digit numbers using strategies based on placevalue and properties of operations.

2.NBT.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.

Add multiples of 100

Add Multiples of 100

3 digit + 1 digit

3 Digit + 1 Digit

3 digit + 2 digit

3 Digit + 2 Digit

3 digit + 3 digit

3 Digit + 3 Digit

Add by composing tens

Add by Composing Tens

Add by composing hundreds

Add by Composing Hundreds

Add by composing tens and hundreds

Add by Composing Tens and Hundreds

Word problems

Word Problems

Subtract multiples of 100

Subtract Multiples of 100

3 digit - 1 digit

3 Digit - 1 Digit

3 digit - 2 digit

3 Digit - 2 Digit

3 digit - 3 digit

3 Digit - 3 Digit

Subtract by breaking up tens

Subtract by Breaking up Tens

Subtract by breaking up hundreds

Subtract by Breaking up Hundreds

Subtract by breaking up tens and hundreds

Subtract by Breaking up Tens and Hundreds

Word problems

Word Problems

2.NBT.8 Mentally add 10 or 100 to a given number 100—900, and mentally subtract 10 or 100 from a given number 100—900.

Add 10 or 100 to a 3 digit number

Add 10 or 100 to a 3 Digit Number

Subtract 10 or 100

Subtract 10 or 100

2.NBT.9 Explain why addition and subtraction strategies work, using place value and the properties of operations.