Addition and Subtraction within 20 by Making 10 Worksheet

The CCSS.MATH.1.OA.C.5 worksheets with answers for 1st grade students to practice problems on Add and subtract within 20 using strategies such as counting on, counting back, making 10, using fact families and related known facts, and composing or decomposing numbers with an emphasis on making ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1=9 or adding 6 + 7 by creating the known equivalent 6 + 4 + 3 = 10 + 3 = 13) is available online for free in printable and downloadable (pdf & image) format. For more questions and answers on 1.OA.C.5 math activities, tap on generate new worksheet to learn, practice, test and verify math skills under the common core cluster (1OAC) add and subtract within 20 in domain operations and algebraic thinking.