+/- within 20

Start with Foundational Facts:

+1/+2, +0, Make Ten, Doubles, +10

Use Foundational Facts to build derived facts (strategies):

• I can use my make ten facts to break apart other numbers (using ten). For example, 8+7 is changed to 8+2+5 or 10+5.

• I can pretend a ten or compensate. For example, 9+4 is like 10+4 but one less.

• I can use my doubles to find near doubles.