1st Grade Common Core Word Problem Worksheets 1.OA.6 Addition and Subtraction Within 20
The attachment is a packet of five days of worksheets for first grade common core standard CCSS.Math.Content.1.OA.C.6 Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).
It focuses on mental math, fluently adding each math fact within 10 seconds, counting on (which is taught the previous week in the pacing guide that I use) and making tens to add fluently.
Each day has two worksheets, designed to be copied front and back. The front page focuses on the standard of the week and the back page is a review of previous information.
This worksheet was designed to be the first nine weeks of school and there are no missing addend or subtrahend problems.
The review standards are:
CCSS.Math.Content.1.MD.B.3 Tell and write time in hours and half-hours using analog and digital clocks.
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.1