Question

formula for class 7 maths at least 50

Answer 1

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. Addition:  

a

b

 

+

c

d

 

=

ad+bc

bd

 

2. Subtraction:  

a

b

 

−

c

d

 

=

ad−bc

bd

 

3. Multiplication:  

a

b

 

=

c

d

 

, then a*d = c*b

4. Division:  

a

b

 

c

d

 

 

=

ad

bc

 

Consumer Math Formulas:

When rate of discount is given  Discount =

MP∗Rate ofDiscount

100

 

Simple Interest =  

PTR

100

 

where P = Principal , T = Time in years R = Rate of interest per annum

Principal =  

100∗S.I

R∗T

 

Rate =  

100∗S.I

P∗T

 

Time =  

100∗S.I

P∗R

 

Principal = Amount- Simple Interest

Discount = MP-SP

Commutative and Associative properties of sets:

Commutative  property:

1. AnB = BnA

2. AuB = BuA

Associative   property:

 

1. (AnB)nC= An(BnC)

2. (AuB)uC= Au(Buc)

Expansion of Algebraic Expression:

1.(x+a) (x+b) = x2+x(a+b)+(ab)

2.(a+b)2 = a2+2ab+b2

3.(a-b)2   = a2-2ab+b2

4.(a2-b2) = (a+b) (a-b)

Properties of Multiplication of Algebraic Terms:

Commutative law:  a*b = b*a

Associative law:  a*(b*c) = (b*c)*a = (c*a)*b

Distributive law:         a(b+c) = ab+ac

Speed and Time:

Speed =  

distance travelled

Time Taken

 

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Answer 2

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Mathematics is so important in our life. Because we use the mathematical equation in our daily life activities. Every student should have a clear understanding of the Maths formulas and their applications.

Refer the class 7 maths formulas to solve complex problems. Some topics involved in class 7 Mathematics are as follows:

• Number System
• Integers
• Fractions
• Decimals
• Mensuration
• Algebra
• Ratio and Proportion