Lessons for 1.NBT.C.4
Ten more and ten lessAdding ten makes one more ten: the ones stay the same and the tens go up by one, so 36 becomes 46.Lesson
Adding two-digit numbers without regroupingTens add to tens and ones add to ones with no bundling needed.Lesson
Adding a one-digit number to a two-digit number by making a tenAdding a one-digit number to a two-digit number such as 38 + 5 by filling up to the next ten, then adding what is left.Lesson
Adding on an open number lineJumping by tens and then by ones from one number up to the total.Lesson
The partial sums methodAdding each place on its own and then combining the parts.Lesson
Regrouping in additionTen ones become one ten so that no place ever holds more than nine.Lesson
Printable Worksheets
Ten more and ten less worksheet (PDF)Printable worksheet with answer keyPreview
Adding two-digit numbers without regrouping worksheet (PDF)Printable worksheet with answer keyPreview
Adding a one-digit number to a two-digit number by making a ten worksheet (PDF)Printable worksheet with answer keyPreview
Adding on an open number line worksheet (PDF)Printable worksheet with answer keyPreview
The partial sums method worksheet (PDF)Printable worksheet with answer keyPreview
Regrouping in addition worksheet (PDF)Printable worksheet with answer keyPreview