# North Carolina - Grade 1 - Math - Operations and Algebraic Thinking - Addition and Subtraction Word Problems - NC.1.OA.1

### Description

Represent and solve addition and subtraction word problems, within 20, with unknowns, by using objects, drawings, and equations with a symbol for the unknown number to represent the problem, when solving: • Add to/Take from-Change Unknown • Put together/Take Apart-Addend Unknown • Compare-Difference Unknown

• State - North Carolina
• Standard ID - NC.1.OA.1
• Subjects - Math Common Core

### Keywords

• Math
• Operations and Algebraic Thinking

## More North Carolina Topics

Represent and solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, by using objects, drawings, and equations with a symbol for the unknown number.

Using concrete models or drawings, strategies based on place value, properties of operations, and explaining the reasoning used, add, within 100, in the following situations: • A two-digit number and a one-digit number • A two-digit number and a multiple of 10

Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90, explaining the reasoning, using: • Concrete models and drawings • Number lines • Strategies based on place value • Properties of operations • The relationship between addition and subtraction

Order three objects by length; compare the lengths of two objects indirectly by using a third object.

Tell and write time in hours and half-hours using analog and digital clocks.