Mathematics: Number Names and Angles

Number Names

• Number names convert numerical values into their equivalent word forms (e.g., 1 is "one," 2 is "two").
• They are used for clarity in communication, especially in writing checks or official documents.

Types of Angles

• Acute Angle: Measures less than 90 degrees.
• Right Angle: Measures exactly 90 degrees; often marked by a small square in illustrations.
• Obtuse Angle: Measures more than 90 degrees but less than 180 degrees.
• Straight Angle: Measures exactly 180 degrees, forming a straight line.
• Reflex Angle: Measures more than 180 degrees but less than 360 degrees.

Drawing an Angle

• To draw an angle, use a protractor for accuracy, ensuring the vertex is at the center.
• Define the angle's measurement and create rays extending from the vertex, forming the angle.

Word Problem

• Word problems require translating a scenario into a mathematical equation to solve for an unknown.
• Key elements include identifying what is given, the question being asked, and relevant operations to apply.

Number of Sides and Angles

• The number of sides in a polygon corresponds directly to the number of angles.
• For instance, a triangle has 3 sides and 3 angles, while a square has 4 sides and 4 angles.

Convert to Improper Fraction

• An improper fraction has a numerator larger than the denominator (e.g., 9/4).
• To convert a mixed number to an improper fraction, multiply the whole number by the denominator and add the numerator.

Finding Multiples

• A multiple of a number is obtained by multiplying that number by an integer (e.g., multiples of 3 are 3, 6, 9, etc.).
• To find multiples, choose a number and iterate through integers to generate the sequence.