IXL Math - District of Columbia first-grade math standards

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District of Columbia

Skills available for District of Columbia first-grade math standards

Standards are in black and IXL math skills are in blue. Hold your mouse over the name of a skill to view a sample problem. Click on the name of a skill to practice that skill.

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1.NSO Number Sense and Operations

1.NSO-N Number Sense
1.NSO-N.1 Count, read, and write whole numbers to 110 and relate them to the quantities they represent.
1.NSO-N.2 Compare and order whole numbers to 110 by using symbols for less than, equal to, or greater than (<, =, >).
1.NSO-N.3 Identify the place value of the digits to 110.
- Counting and number patterns: Hundred chart (First grade - A.10)
1.NSO-N.4 Represent equivalent forms of the same number through the use of physical models, diagrams, and number expressions.
- Counting and number patterns: Counting tens and ones - up to 30 (First grade - A.3)
1.NSO-N.5 Identify numbers to 20 as odd or even.
- Counting and number patterns: Identifying even and odd numbers (First grade - A.11)
- Counting and number patterns: Which even or odd number comes before or after? (First grade - A.12)
1.NSO-N.6 Make combinations of different coins up to 50 cents.
1.NSO-F Fractions
1.NSO-F.7 Model, identify, and represent fractions such as 1/2, 1/3, and 1/4 as parts of wholes (e.g., 1/4 of a pie) and parts of groups.
1.NSO-C Computation and Operations
1.NSO-C.8 Demonstrate the ability to use conventional algorithms for addition and subtraction (two two-digit whole numbers).
1.NSO-C.9 Demonstrate an understanding of various meanings of addition and subtraction, such as addition as combination (i.e., plus, combined with, more), subtraction as comparison (i.e., how much less, how much more), equalizing (i.e., how many more are needed to make these equal), and separation (i.e., how much remaining).
1.NSO-C.10 Know addition and subtraction facts (addends to 10), commit to memory, and use them to solve problems.
1.NSO-C.11 Demonstrate the ability to fluently add and subtract one- and two-digit whole numbers that do not require regrouping.
1.NSO-C.12 Use mental arithmetic to find the sum or difference of two one-digit whole numbers.
1.NSO-C.13 Find the sum of three one-digit whole numbers.
- Addition: Adding three numbers (First grade - B.12)
- Addition: Word problems - adding three numbers (First grade - B.13)
1.NSO-C.14 Identify one more than, one less than, 10 more than, and 10 less than for any number up to 100.
- Counting and number patterns: Hundred chart (First grade - A.10)
1.NSO-C.15 Understand and use the inverse relationship between addition and subtraction to solve problems and check solutions.
- Mixed operations: Fact families (First grade - F.3)
1.NSO-C.16 Know the meaning of "two times something" or "three times something" as an addition (e.g., two times seven means 7 + 7).

1.PRA Patterns, Relations, and Algebra

1.PRA.1 Identify, reproduce, describe, extend, and create simple rhythmic, shape, size, number, color, and letter repeating patterns.
- Patterns: Recognize patterns (First grade - O.1)
- Patterns: Describe patterns (First grade - O.2)
1.PRA.2 Describe and create arithmetic progressions.
- Counting and number patterns: Sequences - count up and down by 1, 2, 3, 5, and 10 (First grade - A.14)
1.PRA.3 Identify arithmetic progressions on the hundreds chart.
- Counting and number patterns: Hundred chart (First grade - A.10)
1.PRA.4 Skip count forward and backward by twos, fives, and tens up to at least 50, starting at any number and using appropriate aids (e.g., hundreds chart, number line).
1.PRA.5 Write and solve number sentences from problem situations that express relationships involving addition and subtraction, including +, -, <, >, =.
1.PRA.6 Apply knowledge of fact families to solve simple open sentences for addition and subtraction that have variables (e.g., __ + 2 = 7 and 10 - __ = 6).
- Mixed operations: Fact families (First grade - F.3)

1.G Geometry

1.G.1 Describe attributes and parts of two- and three-dimensional shapes (e.g., length of sides and number of corners, edges, faces, and sides).
1.G.2 Identify congruent shapes.
- Geometry: Same shape (First grade - J.12)
1.G.3 Identify symmetry in two-dimensional shapes.
- Geometry: Symmetry (First grade - J.11)
1.G.4 Combine shapes and take them apart to make other shapes.
1.G.5 Arrange and describe objects in space by proximity, position, and direction (e.g., near, far, below, above, up, down, behind, in front of, next to, left or right of).
- Spatial sense: Left, middle, and right (First grade - K.1)
- Spatial sense: Above, below, top, middle, and bottom (First grade - K.2)

1.M Measurement

1.M.1 Compare the length, weight, and volume of two or more objects by using direct comparison.
1.M.2 Make and use estimates of measurement, including time and weight.
- Measurement: Which unit of length is appropriate? (First grade - M.2)
- Measurement: Which unit of weight is appropriate? (First grade - M.4)
1.M.3 Measure the length of objects by repeating a nonstandard or standard unit.
- Measurement: Units of length: word problems (First grade - M.3)
1.M.4 Tell time at half-hour intervals on analog and digital clocks using a.m. and p.m., and relate time to events.
1.M.5 Make combinations of coins up to 50 cents.

1.DASP Data Analysis, Statistics, and Probability

1.DASP.1 Use surveys and observations to gather data about themselves and their surroundings.
- Probability and statistics: More, less, and equally likely (First grade - P.1)
- Probability and statistics: Certain, probable, unlikely, and impossible (First grade - P.2)
1.DASP.2 Represent and compare data (e.g., largest, smallest, most often, least often) using tally charts, pictures, and bar graphs.
1.DASP.3 Ask and answer simple questions related to data representations.
- Data and graphs: Record data with tally charts, picture graphs, tables (First grade - L.1)
- Data and graphs: Which bar graph is correct? (First grade - L.4)