How to Calculate Percentages of a Number

Math with Mr. J

In this straightforward instructional video, Mr. J demonstrates the standard algorithm for calculating a percentage of a number using a calculator. The video uses a digital chalkboard format to walk viewers through four distinct examples, ranging from simple integer answers to answers involving decimals. The primary method taught involves converting the percentage to a decimal by moving the decimal point two places to the left (dividing by 100) and then multiplying that decimal by the whole number. The video covers key mathematical concepts including converting percentages to decimals, understanding the mathematical translation of the word "of" to multiplication, and proper calculator entry. A specific emphasis is placed on the mechanical process of decimal movement, including a crucial example involving a single-digit percentage (5%) that requires a placeholder zero. This ensures students understand how to handle various types of percentage values correctly. For educators, this resource serves as an excellent procedural guide for 6th and 7th-grade students learning to efficiently solve percentage problems. It bridges the gap between conceptual understanding and practical calculation, making it ideal for introducing calculator usage in percentage units or for reviewing skills before tackling applied problems like sales tax, tips, and discounts. The clear, step-by-step visual working makes it easy for students to follow along and replicate the process independently.