GRADE 9 MATHEMATICS
GRADE 9 MATHEMATICS REVISION
QUESTIONS WITH STEP-BY-STEP
WORKINGS WITH ANSWERS.
CURRICULUM: CBC Kenya
YEAR: 2025
PREPARED BY:MOCHI....
>These notes cover the key concepts in 9th grade mathematics,focusing on
geometry and algebra topics taught under CBC curriculum in Kenya.
>The notes are simplified for easy understanding,including examples and
practice questions,and are suitable for quick revision before exams. Commented [id1]:
TOPIC 1:Geometry-Angles and Triangles
.The sum of interior angles in a triangle=180 degrees
.Exterior angle=sum of the two opposite interior angles
.Types of triangles:
*Equilateral-all sides are equal,all angles 60 degrees
*Isosceles-two sides and two angles are equal
*Scalene-all sides and angles are different
Example Question:
Find the value of angle X in a triangle where the other angles are 45 degrees and
70 degrees.
Therefore; X=180 –(45+70)=65 degrees
TOPIC 2:Algebra-Simplifying algebraic expressions
*Combine like terms:
Example:3x+ 5x-2=8x-2
GRADE 9 MATHEMATICS REVISION
QUESTIONS WITH STEP-BY-STEP
WORKINGS WITH ANSWERS.
CURRICULUM: CBC Kenya
YEAR: 2025
PREPARED BY:MOCHI....
>These notes cover the key concepts in 9th grade mathematics,focusing on
geometry and algebra topics taught under CBC curriculum in Kenya.
>The notes are simplified for easy understanding,including examples and
practice questions,and are suitable for quick revision before exams. Commented [id1]:
TOPIC 1:Geometry-Angles and Triangles
.The sum of interior angles in a triangle=180 degrees
.Exterior angle=sum of the two opposite interior angles
.Types of triangles:
*Equilateral-all sides are equal,all angles 60 degrees
*Isosceles-two sides and two angles are equal
*Scalene-all sides and angles are different
Example Question:
Find the value of angle X in a triangle where the other angles are 45 degrees and
70 degrees.
Therefore; X=180 –(45+70)=65 degrees
TOPIC 2:Algebra-Simplifying algebraic expressions
*Combine like terms:
Example:3x+ 5x-2=8x-2
