We are going to discuss the combination of addition and subtraction here.

To show the problems of both addition and subtraction, let’s first group all numbers with ‘+’ and ‘-‘ signs. We find the sum of the numbers with a ‘+’ sign and also the sum of all numbers with a ‘-‘ sign and then determine the difference. If there is no sign in front of a number, it means a ‘+’ sign.

The rules that can be used to solve the sums of addition (+) and subtraction (-) together are:

I: First add and then subtract,

II: Solve the numbers enclosed in the brackets, then keep solving.

Solved example with addition (+) and subtraction (-) together:

1. Solve 3252 – 1802 + 2610

Solution:

3 2 5 2

+ 2 6 1 0

5 8 6 2

Now

5 8 6 2

1 8 0 2

4 0 6 0

2. Find the solution for (7259 – 5369) + 2156

Solution:

6 11 15

7 2 5 9

5 3 6 9

1 8 9 0

Now

1 1

1 8 9 0

+ 2 1 5 6

4 0 4 6

3. Subtract 4926 from the sum of 3051 and 4257

Solution:

Sum of 3051 and 4257

1

3 0 5 1

+ 4 2 5 7

7 3 0 8

Now pull 4926 from 7308. from

6 12 10

7 3 0 8

4 9 2 6

2 3 8 2

4. Solve 481 + 356 – 168.

Solution:

Step I: Add the numbers with the ‘+’ sign. Step II: Subtract the number with the ‘-‘ sign from the sum of the numbers with the ‘+’ sign. Hence 481 + 356 – 168 = 669

Word problems for addition and subtraction together:

5. Daniel has 478 chocolate chip cookies and 245 chocolate chip cookies. He distributed 323 cookies to his friends. How many cookies were left with him?

Solution:

Chocolate Chip Cookies = 478

Chocolate Chip Cookies = 245

Step I: additive Total number of cookies = 478 + 245 = 753

Distributed Cookies = 323

Step II: subtraction Cookies with Daniel = 753 – 323 = 430

Math worksheets for 3rd grade

3rd grade math class

From the combination of addition and subtraction to the HOMEPAGE

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