How to Add Decimals to Whole Numbers

Math with Mr. J

This concise math tutorial demonstrates the correct procedure for adding whole numbers and decimals. The video addresses a common student stumbling block: knowing how to align a whole number (which lacks a visible decimal point) with a decimal number. Through two clear examples, the instructor models the process of identifying the implicit decimal point at the end of a whole number, aligning the numbers vertically, and using placeholder zeros to ensure accuracy. The video covers two distinct examples: a single-digit whole number added to a decimal in the hundredths place ($4 + 0.39$), and a two-digit whole number added to a decimal ($57 + 12.88$). Special emphasis is placed on the visual setup of the problem, highlighting that proper alignment is the key to getting the correct answer. The instructor uses a chalkboard style format to write out the steps in real-time, making it easy for viewers to follow the logic. For educators, this resource is excellent for addressing the specific misconception that whole numbers cannot be easily added to decimals or that numbers should always be right-aligned. It provides a quick, direct explanation of "placeholder zeros" and the "invisible decimal," concepts that are foundational for 5th and 6th-grade operations. It can be used as a flipped classroom assignment, a refresher for struggling students, or a direct instructional model during a lesson on decimal operations.