  # West Virginia - Grade 1 - Math - Operations and Algebraic Thinking - Adding and Subtracting within 20 - M.1.4-6

### Description

(4) Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8. Add and subtract within 20. (5) Relate counting to addition and subtraction (e.g., by counting on 2 to add 2). (6) Add and subtract within 20, demonstrating fluency for addition and subtraction within 10 and use strategies such ascounting 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).

• State - West Virginia
• Standard ID - M.1.4-6
• Subjects - Math Common Core

### Keywords

• Math
• Operations and Algebraic Thinking

## More West Virginia Topics Tell and write time in hours and half-hours using analog and digital clocks. 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. Distinguish between defining attributes (e.g., triangles are closed and three-sided) versus non-defining attributes (e.g., color, orientation, overall size) ; build and draw shapes to possess defining attributes. Compose two-dimensional shapes (rectangles, squares, trapezoids, triangles, half-circles, and quarter-circles) or three-dimensional 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.1 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.

## Here is the skill that West Virginia requires you to master

• State Test West Virginia General Summative Assessment
• State Standards NxG CSOs - Next Generation Content Standards and Objectives
• Subject Math
• Topic Name Adding and Subtracting within 20
• Standard ID M.1.4-6
• Description
(4) Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8. Add and subtract within 20. (5) Relate counting to addition and subtraction (e.g., by counting on 2 to add 2). (6) Add and subtract within 20, demonstrating fluency for addition and subtraction within 10 and use strategies such ascounting 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).  