Bumper Car Math: Addition & Subtraction
WCA 4222 Grades 1-6
4222 Bumper Car Math – Addition & Subtraction
1.OA.6. Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten ; decomposing a number leading to a ten; using the relationship between addition and subtraction and creating equivalent but easier or known sums.
2.OA.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.