Second Grade Common Core Math 2 OA.2 Fluently Add & Subtract Within 20 2.OA.2 Practice provides two ways for students to practice and show mastery of their ability to use mental math to fluently apply addition and subtraction skills.
It includes 40 distinct problems in two sets (129 slides in all!), with and without following answer slides. The PowerPoint file can be used on computers, or Promethean Activboard and Smart boards.
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Standard 2.OA.2 Add and subtract within 20.
2. Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know from memory all sums of two one-digit numbers.