Seeing addition and subtraction
A number line shows adding as moving forward and taking away as moving back. It is the bridge from counting objects to mental math.Common Core standards
- 1.OA.C.5Relate counting on and counting back to adding and subtracting.
- 2.MD.B.6Show whole numbers, sums and differences within 100 on a number line.
Summaries in our own words; see the Common Core State Standards for the full text.