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**

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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