Lessons for 2.OA.B.2
Adding and subtracting within 20Fluent facts, using ten as a landmark.Lesson
Counting up to find a differenceStarting at the smaller number and adding on until the larger one is reached.Lesson
Counting on to add and counting back to subtractStarting at the larger part and counting forward by the smaller one.Lesson
Doubles and near doublesThe sums in which both parts are the same number.Lesson
Fact familiesOne trio of numbers gives two addition sentences and two subtraction sentences.Lesson
Adding and subtracting within 20 from memoryEvery sum and difference within 20 is known quickly, by recall or by a fast mental strategy.Lesson
Making ten and bridging through tenMoving part of one addend across to fill a ten before adding the rest.Lesson
Printable Worksheets
Counting up to find a difference worksheet (PDF)Printable worksheet with answer keyPreview
Counting on to add and counting back to subtract worksheet (PDF)Printable worksheet with answer keyPreview
Doubles and near doubles worksheet (PDF)Printable worksheet with answer keyPreview
Fact families worksheet (PDF)Printable worksheet with answer keyPreview
Adding and subtracting within 20 from memory worksheet (PDF)Printable worksheet with answer keyPreview
Making ten and bridging through ten worksheet (PDF)Printable worksheet with answer keyPreview