**Lesson Steps**:

Step 1: Add the units digits, i.e., 3 + 0 = 3

Step 2: Add the tens digits, i.e., 0 + 2 = 2

Since there are no digits in the hundreds and thousands places, we conclude.

27,803

+20

27,823

**Answer**:

27,823

**Grade**: 5

**Level**: Primary

**Subject**: Math

**Topic**: Addition