Topic Details (Notes format)

How to Add and Subtract Fractions (Different Denominators)

Subject: Mathematics

Book: Maths Mastery

To add or subtract fractions with different denominators, find a common denominator—often the LCM of the denominators—then adjust each fraction accordingly. For example, with 1/3 and 1/4, the LCM is 12, so 1/3 = 4/12 and 1/4 = 3/12. Then 4/12 + 3/12 = 7/12. Subtraction is similar but you subtract numerators. Maintaining a step-by-step method ensures consistent accuracy, essential in contexts like cooking measurements, scaling up recipe portions, or dividing shared resources equitably. Continuously practicing fraction addition and subtraction nurtures confidence in handling more complex rational expressions later.

Practice Questions

What is the square root of 0.25?

View Question

What is the sum of the first 10 positive even numbers?

View Question

If the radius of a circle is 7 cm, what is its circumference?

View Question

If 8x = 512, what is the value of x?

View Question

The sides of a triangle are 7, 24, and 25. Is this a right triangle?

View Question

A number is increased by 20% and then decreased by 20%. What is the net change?

View Question

If a:b = 7:9 and b:c = 5:6, what is a:c?

View Question

What is the LCM of 15 and 20?

View Question

What is the cube of 4?

View Question

If the sum of the squares of two consecutive positive integers is 365, what are the integers?

View Question