Common Core math · K–2
All 52 standards, one video each
Every Kindergarten, Grade 1 and Grade 2 math standard in the library, with its code, what it asks for, and the video that teaches it. Use it to find the lesson that matches your child's homework or your next class.
K Kindergarten 17 lessons · 44 min
K.CC Counting & Cardinality
| Standard | What it asks for | Video |
|---|---|---|
| K.CC.A.1 | Count to 100 by ones and by tens. | Count to 100 by 1s and 10s 6:38 · free |
| K.CC.A.2 | Count forward beginning from a given number within the known sequence. | Count On from Any Number 0:35 |
| K.CC.A.3 | Write numbers from 0 to 20. Represent a number of objects with a written numeral 0-20. | Write Numbers 0 to 20 0:42 |
| K.CC.B.4 | Understand the relationship between numbers and quantities; connect counting to cardinality. | Count Objects One by One 2:00 |
| K.CC.B.5 | Count to answer "how many?" questions. | How Many? Let's Count! 1:26 |
| K.CC.C.6 | Identify whether the number of objects in one group is greater than, less than, or equal to the number of objects in another group. | More, Less, or Equal? 2:48 |
| K.CC.C.7 | Compare two numbers between 1 and 10 presented as written numerals. | Compare Numbers 1 to 10 3:31 |
K.OA Operations & Algebraic Thinking
| Standard | What it asks for | Video |
|---|---|---|
| K.OA.A.1 | Represent addition and subtraction with objects, fingers, mental images, drawings. | Show Adding and Taking Away 2:54 |
| K.OA.A.2 | Solve addition and subtraction word problems, and add and subtract within 10. | Add & Subtract Word Problems 3:00 |
| K.OA.A.3 | Decompose numbers less than or equal to 10 into pairs in more than one way. | Break Apart Numbers to 10 1:00 |
K.NBT Number & Operations in Base Ten
| Standard | What it asks for | Video |
|---|---|---|
| K.NBT.A.1 | Compose and decompose numbers from 11 to 19 into ten ones and some further ones. | Teen Numbers: Ten and Some Ones 4:00 |
K.MD Measurement & Data
| Standard | What it asks for | Video |
|---|---|---|
| K.MD.A.1 | Describe measurable attributes of objects, such as length or weight. | What Can We Measure? 4:39 |
| K.MD.A.2 | Directly compare two objects with a measurable attribute in common. | Compare Two Objects 0:40 |
| K.MD.B.3 | Classify objects into given categories. | Sort Objects into Groups 4:04 |
K.G Geometry
| Standard | What it asks for | Video |
|---|---|---|
| K.G.A.1 | Describe objects in the environment using names of shapes. | Shapes All Around Us 1:50 |
| K.G.A.2 | Correctly name shapes regardless of their orientations or overall size. | Name That Shape! 1:53 · free |
| K.G.A.3 | Identify shapes as two-dimensional (lying in a plane, "flat") or three-dimensional ("solid"). | Flat or Solid Shapes? 2:44 |
1 Grade 1 16 lessons · 1 hr 6 min
1.OA Operations & Algebraic Thinking
| Standard | What it asks for | Video |
|---|---|---|
| 1.OA.A.1 | Use addition and subtraction within 20 to solve word problems. | Word Problems Within 20 2:05 · free |
| 1.OA.B.3 | Apply properties of operations as strategies to add and subtract. | Smart Ways to Add & Subtract 7:24 |
| 1.OA.B.4 | Understand subtraction as an unknown-addend problem. | Subtract by Thinking Addition 5:45 |
| 1.OA.C.5 | Relate counting to addition and subtraction. | Count On to Add & Subtract 2:04 |
| 1.OA.C.6 | Add and subtract within 20, demonstrating fluency. | Add & Subtract Within 20 5:37 |
| 1.OA.D.7 | Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. | The Equal Sign: True or False? 5:09 |
1.NBT Number & Operations in Base Ten
| Standard | What it asks for | Video |
|---|---|---|
| 1.NBT.A.1 | Count to 120, starting at any number less than 120. | Count to 120 5:21 |
| 1.NBT.B.2 | Understand that the two digits of a two-digit number represent amounts of tens and ones. | Tens and Ones 4:04 · free |
| 1.NBT.B.3 | Compare two two-digit numbers based on meanings of the tens and ones digits. | Compare Two-Digit Numbers 1:54 |
| 1.NBT.C.4 | Add within 100, including adding a two-digit number and a one-digit number. | Add Within 100 5:26 |
| 1.NBT.C.6 | Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90. | Subtract Tens 1:12 |
1.MD Measurement & Data
| Standard | What it asks for | Video |
|---|---|---|
| 1.MD.A.1 | Order three objects by length; compare the lengths of two objects indirectly by using a third object. | Order Objects by Length 3:15 |
| 1.MD.A.2 | Express the length of an object as a whole number of length units. | Measure with Paper Clips 0:50 |
| 1.MD.B.3 | Tell and write time in hours and half-hours using analog and digital clocks. | Tell Time: Hours & Half-Hours 7:46 |
| 1.MD.C.4 | Organize, represent, and interpret data with up to three categories. | Sort Data & Make a Bar Graph 5:01 |
1.G Geometry
| Standard | What it asks for | Video |
|---|---|---|
| 1.G.A.1 | Distinguish between defining attributes versus non-defining attributes. | What Makes a Shape? 3:05 |
2 Grade 2 19 lessons · 1 hr 28 min
2.OA Operations & Algebraic Thinking
| Standard | What it asks for | Video |
|---|---|---|
| 2.OA.A.1 | Use addition and subtraction within 100 to solve one- and two-step word problems. | Word Problems Within 100 9:26 |
| 2.OA.B.2 | Fluently add and subtract within 20 using mental strategies. | Mental Math Within 20 7:36 |
| 2.OA.C.3 | Determine whether a group of objects (up to 20) has an odd or even number of members. | Odd or Even? 3:24 · free |
| 2.OA.C.4 | Use addition to find the total number of objects arranged in rectangular arrays. | Add with Arrays 1:08 |
2.NBT Number & Operations in Base Ten
| Standard | What it asks for | Video |
|---|---|---|
| 2.NBT.A.1 | Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones. | Hundreds, Tens & Ones 5:26 · free |
| 2.NBT.A.2 | Count within 1000; skip-count by 5s, 10s, and 100s. | Skip-Count by 5s, 10s & 100s 8:12 |
| 2.NBT.A.3 | Read and write numbers to 1000 using base-ten numerals, number names, and expanded form. | Read & Write Numbers to 1000 3:39 |
| 2.NBT.B.5 | Fluently add and subtract within 100 using strategies based on place value. | Add & Subtract Within 100 5:29 |
| 2.NBT.B.6 | Add up to four two-digit numbers using strategies based on place value and properties of operations. | Add Up to Four Numbers 1:35 |
| 2.NBT.B.7 | Add and subtract within 1000, using concrete models or drawings and strategies based on place value. | Add & Subtract Within 1000 3:21 |
2.MD Measurement & Data
| Standard | What it asks for | Video |
|---|---|---|
| 2.MD.A.1 | Measure the length of an object by selecting and using appropriate tools such as rulers. | Measure with a Ruler 10:57 |
| 2.MD.A.4 | Measure to determine how much longer one object is than another. | How Much Longer? 1:10 |
| 2.MD.B.5 | Use addition and subtraction within 100 to solve word problems involving lengths. | Length Word Problems 4:10 |
| 2.MD.B.6 | Represent whole numbers as lengths from 0 on a number line diagram. | Numbers on a Number Line 1:35 |
| 2.MD.C.7 | Tell and write time from analog and digital clocks to the nearest five minutes. | Tell Time to 5 Minutes 7:00 |
| 2.MD.D.9 | Generate measurement data by measuring lengths of several objects. | Measure & Record Lengths 5:20 |
| 2.MD.D.10 | Draw a picture graph and a bar graph. | Picture Graphs & Bar Graphs 3:12 |
2.G Geometry
| Standard | What it asks for | Video |
|---|---|---|
| 2.G.A.1 | Recognize and draw shapes having specified attributes. | Draw & Name Shapes 3:30 |
| 2.G.A.2 | Partition a rectangle into rows and columns of same-size squares. | Rows & Columns of Squares 1:24 |