Khan Academy: Early math
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 addition
 counting
 geometry
 measurement
 patterns
 subtraction
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Khan Academy: Early Math's missions focus on 74 basic – and some not so basic – math skills in five categories: counting, place value and patterns, addition and subtraction, measurement and data, and geometry. The drills here make for good practice  you can also use them as a formative assessment tool, or as a placement tool, at any time during the year. Detailed progress reports and leveling can help you further pinpoint strengths or areas for improvement. Use this early math resource as a supplement, for homework, for test prep, or as a guide for differentiated learning. However, the drills can be tedious, the brief explanations can be confusing, and the approach doesn't always lend itself well to teaching these concepts to kids this young.
Read More Read LessKey Standards Supported
Counting And Cardinality  
K.CC: Compare Numbers.  
K.CC.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, e.g., by using matching and counting strategies.1 
Count To Tell The Number Of Objects.  
K.CC.4.a  When counting objects, say the number names in the standard order, pairing each object with one and only one number name and each number name with one and only one object. 
K.CC.4.b  Understand that the last number name said tells the number of objects counted. The number of objects is the same regardless of their arrangement or the order in which they were counted. 
K.CC.5  Count to answer “how many?” questions about as many as 20 things arranged in a line, a rectangular array, or a circle, or as many as 10 things in a scattered configuration; given a number from 1–20, count out that many objects. 
Know Number Names And The Count Sequence.  
K.CC.1  Count to 100 by ones and by tens. 
K.CC.2  Count forward beginning from a given number within the known sequence (instead of having to begin at 1). 
Geometry  
1.G: Reason With Shapes And Their Attributes.  
1.G.1  Distinguish between defining attributes (e.g., triangles are closed and threesided) versus nondefining attributes (e.g., color, orientation, overall size); build and draw shapes to possess defining attributes. 
1.G.2  Compose twodimensional shapes (rectangles, squares, trapezoids, triangles, halfcircles, and quartercircles) or threedimensional shapes (cubes, right rectangular prisms, right circular cones, and right circular cylinders) to create a composite shape, and compose new shapes from the composite shape.4 
1.G.3  Partition circles and rectangles into two and four equal shares, describe the shares using the words halves, fourths, and quarters, and use the phrases half of, fourth of, and quarter of. Describe the whole as two of, or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares. 
2.G: Reason With Shapes And Their Attributes.  
2.G.1  Recognize and draw shapes having specified attributes, such as a given number of angles or a given number of equal faces.5 Identify triangles, quadrilaterals, pentagons, hexagons, and cubes. 
2.G.2  Partition a rectangle into rows and columns of samesize squares and count to find the total number of them. 
2.G.3  Partition circles and rectangles into two, three, or four equal shares, describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths. Recognize that equal shares of identical wholes need not have the same shape. 
K.G: Analyze, Compare, Create, And Compose Shapes.  
K.G.4  Analyze and compare two and threedimensional shapes, in different sizes and orientations, using informal language to describe their similarities, differences, parts (e.g., number of sides and vertices/“corners”) and other attributes (e.g., having sides of equal length). 
Identify And Describe Shapes (Squares, Circles, Triangles, Rectangles, Hexagons, Cubes, Cones, Cylinders, And Spheres).  
K.G.2  Correctly name shapes regardless of their orientations or overall size. 
Measurement And Data  
1.MD: Measure Lengths Indirectly And By Iterating Length Units.  
1.MD.1  Order three objects by length; compare the lengths of two objects indirectly by using a third object. 
1.MD.2  Express the length of an object as a whole number of length units, by laying multiple copies of a shorter object (the length unit) end to end; understand that the length measurement of an object is the number of samesize length units that span it with no gaps or overlaps. Limit to contexts where the object being measured is spanned by a whole number of length units with no gaps or overlaps. 
Represent And Interpret Data.  
1.MD.4  Organize, represent, and interpret data with up to three categories; ask and answer questions about the total number of data points, how many in each category, and how many more or less are in one category than in another. 
Tell And Write Time.  
1.MD.3  Tell and write time in hours and halfhours using analog and digital clocks. 
2.MD: Measure And Estimate Lengths In Standard Units.  
2.MD.1  Measure the length of an object by selecting and using appropriate tools such as rulers, yardsticks, meter sticks, and measuring tapes. 
2.MD.2  Measure the length of an object twice, using length units of different lengths for the two measurements; describe how the two measurements relate to the size of the unit chosen. 
2.MD.3  Estimate lengths using units of inches, feet, centimeters, and meters. 
2.MD.4  Measure to determine how much longer one object is than another, expressing the length difference in terms of a standard length unit. 
Represent And Interpret Data.  
2.MD.10  Draw a picture graph and a bar graph (with singleunit scale) to represent a data set with up to four categories. Solve simple put together, takeapart, and compare problems4 using information presented in a bar graph. 
Work With Time And Money.  
2.MD.7  Tell and write time from analog and digital clocks to the nearest five minutes, using a.m. and p.m. 
2.MD.8  Solve word problems involving dollar bills, quarters, dimes, nickels, and pennies, using $ and ¢ symbols appropriately. Example: If you have 2 dimes and 3 pennies, how many cents do you have? 
K.MD: Describe And Compare Measurable Attributes.  
K.MD.1  Describe measurable attributes of objects, such as length or weight. Describe several measurable attributes of a single object. 
K.MD.2  Directly compare two objects with a measurable attribute in common, to see which object has “more of”/“less of” the attribute, and describe the difference. For example, directly compare the heights of two children and describe one child as taller/shorter. 
Operations And Algebraic Thinking  
1.OA: Add And Subtract Within 20.  
1.OA.6  Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13). 
Work With Addition And Subtraction Equations.  
1.OA.7  Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 – 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2. 
1.OA.8  Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = � – 3, 6 + 6 = �. 
2.OA: Add And Subtract Within 20.  
2.OA.2  Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two onedigit numbers. 
Work With Equal Groups Of Objects To Gain Foundations For Multiplication.  
2.OA.4  Use addition to find the total number of objects arranged in rectangular arrays with up to 5 rows and up to 5 columns; write an equation to express the total as a sum of equal addends. 
K.OA: Understand Addition As Putting Together And Adding To, And Under Stand Subtraction As Taking Apart And Taking From.  
K.OA.3  Decompose numbers less than or equal to 10 into pairs in more than one way, e.g., by using objects or drawings, and record each decomposition by a drawing or equation (e.g., 5 = 2 + 3 and 5 = 4 + 1). 
K.OA.4  For any number from 1 to 9, find the number that makes 10 when added to the given number, e.g., by using objects or drawings, and record the answer with a drawing or equation. 
K.OA.5  Fluently add and subtract within 5. 
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