Finding Missing: Problem Solving & Reasoning
Mathematics
Grade 8
12 questions
~24 mins
1 views0 downloads
About This Worksheet
A worksheet focusing on finding missing angles on straight lines through problem solving and reasoning, ideal for Grade 8 students.
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Full preview • 12 questions
Finding Missing: Problem Solving & Reasoning
Subject: MathematicsGrade: Grade 8
Name:
Date:
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Untitled Worksheet
Grade Grade 8
A
Practice Questions
Answer all questions. Show your working in the grid spaces provided.
1.
If one angle on a straight line measures 65°, find the adjacent angle.
[2 marks]2.
Two angles on a straight line are supplementary. One angle is 120°. What is the other angle?
[2 marks]3.
Construct a straight line with an angle of 45° and find the adjacent angle.
[3 marks]4.
In a diagram, two angles are on a straight line with measures 80° and x°. If these are adjacent, find x.
[2 marks]5.
A straight line has two angles: 130° and y°. Find y.
[2 marks]6.
A pair of angles on a straight line are supplementary. If one angle is 75°, find the other.
[2 marks]7.
A straight line forms two angles: 100° and an unknown angle. Calculate the missing angle.
[2 marks]8.
Two angles add up to 180°. If one angle is 85°, what is the other?
[2 marks]9.
A diagram shows a straight line with angles 60° and x°. Calculate x.
[2 marks]10.
Real-world scenario: A road intersection forms a straight line. If the angle between the north-south road and an east-west road is 90°, and a traffic sign indicates 45°, what is the measure of the other adjacent angle?
[3 marks]11.
Challenge: In a straight line, two angles are supplementary. The larger angle measures 3x + 10°, and the smaller measures 2x + 40°. Find x and the two angles.
[4 marks]12.
Error analysis: A student states that angles of 70° and 120° on a straight line are both correct. Identify the mistake and correct it.
[3 marks]Quick Actions
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Details
- Created
- 1/1/2026
- Updated
- 1/1/2026
- Type
- worksheet