Solve single variable addition and subtraction equations by using mental math
John is a marble collector. Most of the time he remembers to count all his marbles, but today he forgot to count how many green ones he has. If John puts 4 blue marbles, 2 purple marbles, 1 red marble, 5 yellow marbles and an unknown amount of green marbles in his collector pouch that can hold up to 15 marbles. Move the different colored marbles into the bag.
Practice Mental Math for Addition and Subtraction Equations questions
Develop understanding of concepts by studying them in a relational manner. Analyze and refine the concept by summarizing the main idea, creating visual aids, and generating questions and comments using a Four Square Concept Matrix.