Lessons for 2.NBT.B.7
Counting up to find a differenceStarting at the smaller number and adding on until the larger one is reached.Lesson
Multi-digit additionAdd by place value, regrouping when a column passes nine.Lesson
Multi-digit subtractionSubtract by place value, regrouping when a column runs short.Lesson
Adding on an open number lineJumping by tens and then by ones from one number up to the total.Lesson
Regrouping in additionTen ones become one ten so that no place ever holds more than nine.Lesson
Regrouping in subtractionOne ten is broken into ten ones when a place does not have enough.Lesson
The standard addition algorithmAdding column by column from the right and carrying into the next place.Lesson
Subtracting three-digit numbers by place value, including across zeroSubtracting within 1,000 hundreds from hundreds, tens from tens and ones from ones, trading a hundred or a ten when needed, even across a zero.Lesson
Printable Worksheets
Counting up to find a difference worksheet (PDF)Printable worksheet with answer keyPreview
Adding on an open number line worksheet (PDF)Printable worksheet with answer keyPreview
Regrouping in addition worksheet (PDF)Printable worksheet with answer keyPreview
Regrouping in subtraction worksheet (PDF)Printable worksheet with answer keyPreview
The standard addition algorithm worksheet (PDF)Printable worksheet with answer keyPreview
Subtracting three-digit numbers by place value, including across zero worksheet (PDF)Printable worksheet with answer keyPreview