If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

STANDARDS

 > 

US-KS

Math

Kansas Math

Grade 2: Operations and Algebraic Thinking

Represent and solve problems involving addition and subtraction.

2.OA.1

Fully covered
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 situation equations and/or solution equations with a symbol for the unknown number to represent the problem.)

Add and subtract within 20.

2.OA.2

Mostly covered
Fluently (efficiently, accurately, and flexibly) add and subtract within 20 using mental strategies (counting on, making a ten, decomposing a number, creating an equivalent but easier and known sum, and using the relationship between addition and subtraction). Work with equal groups of objects to gain foundations for multiplication.

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

2.OA.3

Mostly covered
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.

2.OA.4

Fully covered
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.