Class 7 Math Formulas

The widespread usage of mathematics in day-to-day life makes it important to have a basic understanding of the class 7 math formulas. Usually, students tend to lose their interest in maths due to the complexity that comes with remembering the formulas. Hence, this article makes sure that the students are relieved from the stress of mugging up the class 7 math formulas by presenting them in the most concise manner, along with some very practical tips which if included in daily routine would benefit the students in the long run.

List of Important Maths Formulas for Class 7

• ax / ay = ax-y
• ax /bx = (a/b)x
• (ax)y = axy
• (a-b-c)2 = a2 + b2 + c2 – 2ab + 2bc – 2ac
• Increase in Percentage = (Change / Original Amount ) × 100
• Profit percent = (Profit / Cost price) × 100
• Simple Interest = (Principal × Rate × Time) / 100
• Amount = Principal + Interest
• Pythagoras Theorem : (Hypotenuse)2 = (Adjacent Side)2 + (Opposite Side)2
• Area of a Circle = πr 2, where ‘r’ is the radius of a circle and π = 22/7 or 3.14

Rational Numbers Class 7 Math Formulas

The rational numbers class 7 math formulas help students to get an idea of performing arithmetic operations on rational numbers.

• Product of rational numbers = (Product of Numerators) / (Product of Denominators)
• First Rational Number × (Reciprocal of other Rational Number)

Practical Geometry Class 7 Math Formulas

The simple shapes that we see around us have their own importance and usage in our daily activities. Hence, the practical geometry class 7 math formulas help the students to learn more about these shapes and the calculations involved with their dimensions.

• Area of a Square = Side2
• Perimeter of a Square = 4 × Side
• Area of Rectangle = Length × Breadth
• Perimeter of a Rectangle = 2 × (Length + Breadth)
• Area of a Parallelogram = Base × Height
• Area of Triangle = 1/ 2 × Base × Height
• Circumference of a circle = π d, where ‘d’ is the diameter of a circle and π = 22/7 or 3.14
• Area of a circle = πr2

Exponents and Power Formulas for Class 7 Maths

An exponent represents the value which refers to the number of times a number is multiplied by itself. For example, 4 × 4 × 4 can be written as 43. Here, 4 is the base and 3 is the exponent. The formulas (laws) related to exponents help to carry out multiple operations while dealing with large numbers. Here is a list of the different laws of exponents that are used:

• Law of Product: am × an = am+n
• Law of Quotient: am/an = am-n
• Law of Zero Exponent: a0 = 1
• Law of Negative Exponent: a-m = 1/am
• Law of Power of a Power: (am)n = amn
• Law of Power of a Product: (ab)m = ambm
• Law of Power of a Quotient: (a/b)m = am/bm

Comparing Quantities Formulas for Class 7 Maths

In our daily lives, we come across instances where we need to compare two quantities. They might be weights, wages or grades, etc. Hence, it is important to have a clear understanding of ratios and proportions. Ratio is the comparison between two quantities of the same units which shows how much of one quantity is present in the other quantity.

• If any two ratios need to be compared, it can be done so by converting them to like fractions. The two given ratios are equivalent if the two fractions are equal.
• For any four quantities, if their two ratios are equivalent, then those four quantities are said to be proportionate.
• Increase in Percentage = (Change / Original Amount ) × 100
• Profit percent = (Profit / Cost price) × 100
• Simple Interest = (Principal × Rate × Time) / 100
• Amount = Principal + Interest

Algebra Formulas for Class 7 Maths

Variables and constants are used to create algebraic expressions. The algebraic entities mentioned below will help the students deal with variables and constants that need to be added, subtracted, divided or multiplied in order to form an algebraic equation.

• The numerical value in the term is called the coefficient.
• On adding two algebraic expressions the like terms are added together while unlike ones are left out as they are.
• (a-b)2 = a2 – 2ab + b2
• (a-b-c)2 = a2 + b2 + c2 – 2ab + 2bc – 2ac

Applications of Class 7 Maths Formulas

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Class 7 math formulas cover the very basic and practical formulas that have their applicability in various spheres of life.

• The class 7 math formulas help in understanding the functioning of daily activities. Whether it is the calculation of profit and loss, or calculating interest on money, these formulas are used everywhere.
• The mensuration and geometry formulas help in calculating the dimensions of shapes that we come across in our daily life. For example, if one needs to find out how many bricks are needed to build a room, then the knowledge of practical geometry formulas are used.
• Algebraic formulas give us the power to find the unknown values. Any problem that has an unknown variable can be framed in terms of an algebraic equation, and with the help of the algebraic entities, it can be easily solved.

Tips to Memorize Class 7 Maths Formulas

The class 7 math formulas can be easily learnt using a few tips given below.

• It is better to focus on one topic or one formula at a time. Once that one concept or formula becomes clear then only move further to the next topic. To do this the students must ensure that they practice enough problems related to that formula so that they are clear with the logic behind it.
• Whenever students are practising problems, they must also practice writing a step-by-step description of the problem, which are called problem statements. This helps in co-relating between the problem statement and the formula to be used, thereby also ensuring a good habit of learning formulas by writing.
• The students must take advantage of the technology and the devices that they use on an everyday basis. They can download some formula wallpapers and set them as their screensaver on their mobile and laptops. This will make sure that every time they take a look at their device, they are bound to revise a formula or two.

Class 7 Maths Formulas Examples

Example 1: The Cost price of a bag is Rs. 250. If it is sold at Rs. 300, find the profit earned and the profit percentage.

Solution:

Cost Price of the bag = Rs. 250; Selling price = Rs. 300

Since the selling price is more than the cost price there is profit in the transaction. Profit = Selling price = Cost Price

Substituting the values in the formula, Profit = 300 – 250 = 50

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Profit percentage = (Profit /Cost price) × 100

Substituting the values in the formula, Profit percentage = (50/250) × 100 = 20%. Therefore, the profit percentage is 20% .

Example 2: What is the area of a rectangle with length 10 units and breadth (width) 5 units?

Solution :

Area of rectangle = Length × Breadth

Area of one wall = 10 × 5 = 50 square units.

Therefore, the area of the rectangle is 50 square units.

You can download the printable Maths Formulas Class 7 sheet from the link given below:

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