IXL Math - California first-grade math standards

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Skills available for California first-grade math standards

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1.NS Number Sense

1.NS.1.0 Students understand and use numbers up to 100:
1.NS.1.1 Count, read, and write whole numbers to 100.
1.NS.1.2 Compare and order whole numbers to 100 by using the symbols for less than, equal to, or greater than (<, =, >).
1.NS.1.3 Represent equivalent forms of the same number through the use of physical models, diagrams, and number expressions (to 20) (e.g., 8 may be represented as 4 + 4, 5 + 3, 2 + 2 + 2 + 2, 10 - 2, 11 - 3).
1.NS.1.4 Count and group object in ones and tens (e.g., three groups of 10 and 4 equals 34, or 30 + 4).
- Counting and number patterns: Counting tens and ones - up to 30 (First grade - A.3)
1.NS.1.5 Identify and know the value of coins and show different combinations of coins that equal the same value.
1.NS.2.0 Students demonstrate the meaning of addition and subtraction and use these operations to solve problems:
1.NS.2.1 Know the addition facts (sums to 20) and the corresponding subtraction facts and commit them to memory.
1.NS.2.2 Use the inverse relationship between addition and subtraction to solve problems.
- Mixed operations: Fact families (First grade - F.3)
1.NS.2.3 Identify one more than, one less than, 10 more than, and 10 less than a given number.
- Counting and number patterns: Hundred chart (First grade - A.10)
1.NS.2.4 Count by 2s, 5s, and 10s to 100.
1.NS.2.5 Show the meaning of addition (putting together, increasing) and subtraction (taking away, comparing, finding the difference).
1.NS.2.6 Solve addition and subtraction problems with one- and two-digit numbers (e.g., 5 + 58 = __).
1.NS.2.7 Find the sum of three one-digit numbers.
- Addition: Adding three numbers (First grade - B.12)
1.NS.3.0 Students use estimation strategies in computation and problem solving that involve numbers that use the ones, tens, and hundreds places:
1.NS.3.1 Make reasonable estimates when comparing larger or smaller numbers.
- Estimating: Estimate to the nearest ten (First grade - H.1)

1.AF Algebra and Functions

1.AF.1.0 Students use number sentences with operational symbols and expressions to solve problems:
1.AF.1.1 Write and solve number sentences from problem situations that express relationships involving addition and subtraction.
- Addition: Word problems - write the addition sentence (First grade - B.4)
- Subtraction: Word problems - write the subtraction sentence (First grade - D.4)
1.AF.1.2 Understand the meaning of the symbols +, -, =.
- Mixed operations: Which sign makes the number sentence true? (First grade - F.2)
1.AF.1.3 Create problem situations that might lead to given number sentences involving addition and subtraction.

1.MG Measurement and Geometry

1.MG.1.0 Students use direct comparison and nonstandard units to describe the measurements of objects:
1.MG.1.1 Compare the length, weight, and volume of two or more objects by using direct comparison or a nonstandard unit.
- Measurement: Compare size, weight, and capacity (Kindergarten - Q.5)
1.MG.1.2 Tell time to the nearest half hour and relate time to events (e.g., before/after, shorter/longer).
1.MG.2.0 Students identify common geometric figures, classify them by common attributes, and describe their relative position or their location in space:
1.MG.2.1 Identify, describe, and compare triangles, rectangles, squares, and circles, including the faces of three-dimensional objects.
1.MG.2.2 Classify familiar plane and solid objects by common attributes, such as color, position, shape, size, roundness, or number of corners, and explain which attributes are being used for classification.
1.MG.2.3 Give and follow directions about location.
1.MG.2.4 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).

1.SDAP Statistics, Data Analysis, and Probability

1.SDAP.1.0 Students organize, represent, and compare data by category on simple graphs and charts:
1.SDAP.1.1 Sort objects and data by common attributes and describe the categories.
- Sorting, ordering, and classifying: Venn diagrams (First grade - Q.1)
1.SDAP.1.2 Represent and compare data (e.g., largest, smallest, most often, least often) by using pictures, bar graphs, tally charts, and picture graphs.
1.SDAP.2.0 Students sort objects and create and describe patterns by numbers, shapes, sizes, rhythms, or colors:
1.SDAP.2.1 Describe, extend, and explain ways to get to a next element in simple repeating patterns (e.g., rhythmic, numeric, color, and shape).
- Patterns: Recognize patterns (First grade - O.1)
- Patterns: Describe patterns (First grade - O.2)

1.MR Mathematical Reasoning

1.MR.1.0 Students make decisions about how to set up a problem:
1.MR.1.1 Determine the approach, materials, and strategies to be used.
1.MR.1.2 Use tools, such as manipulatives or sketches, to model problems.
- Measurement: Units of length: word problems (First grade - M.3)
- Time: Read a calendar (First grade - R.11)
1.MR.2.0 Students solve problems and justify their reasoning:
1.MR.2.1 Explain the reasoning used and justify the procedures selected.
- 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.MR.2.2 Make precise calculations and check the validity of the results from the context of the problem.
- Measurement: Units of length: word problems (First grade - M.3)
- Time: Time and clocks: word problems (First grade - R.8)
1.MR.3.0 Students note connections between one problem and another.