Solving for Unknown Variables within 20 1.oa.1

by My Little Penguins

Price: 225 points or $2.25 USD

Subjects: math

Grades: 1,2

Description: No prep! Self-checking boom cards. These 26 cards are in random order and will allow students to practice finding unknown variables within 20 using addition and subtraction. See the preview for a sample and see my store for many more decks! CCSS.MATH.CONTENT.1.OA.A.1 Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.