Search the California Content Standards

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

Standard:
Use estimation strategies to make reasonable estimates in problem solving. CA

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

Standard:
Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.

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

Standard:
Explain why addition and subtraction strategies work, using place value and the properties of operations.

Footnote:
Explanations may be supported by drawings or objects.

Cluster:
Represent and solve problems involving addition and subtraction.

Standard:
Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.

Footnote:
See Glossary, Table 1.

Cluster:
Add and subtract within 20.

Standard:
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.

Footnote:
See standard 1.OA.6 for a list of mental strategies.

Cluster:
Work with equal groups of objects to gain foundations for multiplication.

Standard:
Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends.

Cluster:
Work with equal groups of objects to gain foundations for multiplication.

Standard:
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.

Cluster:
Use place value understanding and properties of operations to perform multi-digit arithmetic.

Standard:
Use place value understanding to round whole numbers to the nearest 10 or 100.

Footnote:
A range of algorithms may be used.

Cluster:
Use place value understanding and properties of operations to perform multi-digit arithmetic.

Standard:
Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.

Cluster:
Use place value understanding and properties of operations to perform multi-digit arithmetic.

Standard:
Multiply one-digit whole numbers by multiples of 10 in the range 10–90 (e.g., 9 × 80, 5 × 60) using strategies based on place value and properties of operations.