Subject: Mathematics
Book: Maths Mastery
Percentages are central to countless real-world applications—from calculating exam marks to determining discounts and interest rates. The general formula to find a percentage is: (Part / Whole) × 100%. However, if you already know the rate and the whole, use Percentage of a Number = (Rate ÷ 100) × Whole. For example, to calculate 20% of 150, convert 20% to 0.20, then multiply: 0.20 × 150 = 30. This concept is pivotal in areas like finance and data analysis, so practice by computing percentages for tips in restaurants, taxes on shopping bills, or proportionate contributions in group projects. Mastering this skill builds a strong foundation for advanced percentage operations such as percentage increase, decrease, and compound interest calculations.
If a + b = 10 and ab = 21, what is the value of a^2 + b^2?
View QuestionThe sides of a triangle are 13 cm, 14 cm, and 15 cm. What is its area?
View QuestionIf a cylinder has a radius of 7 cm and height of 10 cm, what is its volume?
View QuestionIf the radius of a circle is 7 cm, what is its circumference?
View QuestionIf x:y = 4:5 and y:z = 2:3, what is x:z?
View QuestionThe area of an equilateral triangle with side length 6 cm is:
View QuestionIf x + y = 10 and xy = 21, what is the value of x³ + y³?
View QuestionIf x = 2 and y = 3, what is the value of (x^2 + y^2)?
View QuestionIf x^2 - 6x + 9 = 0, what is the value of x?
View QuestionWhat is the area of a sector of a circle with radius 14 cm and central angle 90°?
View Question