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Worksheets based on the Fact - Angles on a Straight Line Add to 180

A straight angle is 180°. Go through this assortment of angles on a straight line worksheets to practice finding the unknown angle and finding the value of x. These printer-friendly worksheets on finding the unknown angles are categorized into three levels: easy, moderate, and difficult, to best suit the learning needs of 4th grade and 5th grade children. Some of our worksheets here are absolutely free!

Linear Pair

Go through this bunch of printable worksheets for grade 4 to hone your skills in finding the unknown angle of linear pairs. A linear pair adds up to 180 degrees.

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Find the Unknown Angle - Easy

Bolster your practice with this set of pdf worksheets to find the value of an unknown angle. The angles on a straight line add up to 180°. To find the unknown angle, add up the known angles and subtract from 180°.

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Find the Unknown Angle - Moderate

Go up a level in angles on a straight line with this set of moderate worksheets. Supplied with six problems, this set facilitates a rigorous practice. The measures of two angles are given; the task is for students to find the measure of an unknown angle using the given data.

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Find the Unknown Angle - Difficult

Gear yourself up to practice these difficult worksheets for grade 5. Each question has three known angle measures. Use the information provided to find the unknown values of the other three angles. Every page in this section contains four problems.

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Find the Value of x

These printable worksheets consist of three angles one of which has a variable. To find the value of x for each question, sum up the angles on a straight line, equate them to 180°, and simplify to arrive at the answer.

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Find the Value of x and the Unknown Angle

Reiterate finding the value of x and the unknown angle with these pdf worksheets. Keenly observe each problem, and answer the questions. Be sure to make use of our answer key to check your responses.

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