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Common Core

Skills available for Common Core first-grade math standards

Click on the name of a skill to practice that skill.

    Print Standards

Operations and Algebraic Thinking

Represent and solve problems involving addition and subtraction.

Understand and apply properties of operations and the relationship between addition and subtraction.
  • CC.1.OA.3 Apply properties of operations as strategies to add and subtract. Examples: If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.) To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.) (Students need not use formal terms for these properties.)
  • CC.1.OA.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

Work with addition and subtraction equations.

Number and Operations in Base Ten

Extend the counting sequence.

Understand place value.

Use place value understanding and properties of operations to add and subtract.

Measurement and Data

Measure lengths indirectly and by iterating length units
  • CC.1.MD.1 Order three objects by length; compare the lengths of two objects indirectly by using a third object.
  • CC.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 same-size 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.
  •    » J.01: Length Measurement
       » K.01: Length measurement with non-standard units
       » K.04: Story problems around non-standard units
       » K.05: Review non-standard units
       » K.05: Review non-standard units

Tell and write time.

Represent and interpret data.
  • CC.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.
  •    » Q.11: 2 way venn diagrams


Reason with shapes and their attributes.

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