Divisibility Rules

{2,3,4,5,6,9}

• A number is divisible by 2 if the last digit is even. Example: 24
• A number is divisible by 3 if the sum of the digits is divisible by 3. Example: 759
• A number is divisible by 4 if the last two digits form a number divisible by 4. Example: 116
• A number is divisible by 5 if the last digits is 0 or 5. Example: 25
• A number is divisible by 6 if the number is divisible by both 2 and 3. Example: 12
• A number is divisible by 9 if the sum of the digits is divisible by 9. Example: 927

Types of Angles

• Acute Angle: Measures less than 90 degrees.

• Right Angle: Measures exactly 90 degrees.

• Obtuse Angle: Measures more than 90 degrees but less than 180 degrees.

• Straight Angle: Measures exactly 180 degrees.

• Reflex Angle: Has a measure greater than 180 degrees.

• Full Rotation: Measures exactly 360 degrees.

• Zero Angle: Measures 0 degrees.