Solving simple equations

Students will be able to solve simple equations (using simple operations)

Multiple Choice

Give a simple equation for the statement:

John has some marbles, and he gives away 3 marbles to his friend. He is left with 2 marbles.

• m + 2 = 3

• m = 3

• m - 3 =2

• 3m = 2

Multiple Choice

Sara bought a book for Rs. 15 and a pen for x. She spent a total of Rs. 20. Create an equation for the statement.

• x = 15

• x + 15 = 20

• 15x = 20

• 5x = 20

Multiple Choice

Create an equation for: Twice of a number subtracted from 8 gives 10.

• 8 - 2n = 10

• 2n - 8 = 10

• 2n - 10 = 8

• 10 - 2n = 8

​How key steps to solve simple equations

1. identify the variable in the equation.

2. identify the operation in the equation.

3. Perform opposite operation on both sides of the equation

4. Continue step 3 till we have only variable on one side of the equation.

​Solving an equality

Is the statement an equality: 8 – 3 = 4 + 1

Can you identify the LHS and RHS of the equation?

LHS = RHS =

​Solving an equality

Is the statement an equality: 8 – 3 = 4 + 1

Let's add 2 on both the sides of the equality. what do we get?

8 – 3 + 2 = 4 + 1 + 2

LHS =
RHS =

​Solving an equality

Is the statement an equality: 8 – 3 = 4 + 1

Now, let's subtract 2 from both the sides of the equality. what do we get?

8 – 3 - 2 = 4 + 1 - 2

LHS =
RHS =

• If we add the same number to both sides of an equality, it still holds.

• If we subtract the same number from both sides of an equality, it still holds

​x + 5 = 12

​Let's solve one equation together

y - 8 = 20

In your groups, try

​Practice time

1. Solve each question in your notebook

2. Then select the right answer