About this worksheet
Once carrying is understood, switch Regrouping to "Some problems" so children have to decide whether to carry rather than carrying by habit, then move on to three digits. The 30- and 50-problem versions suit a timed fluency check later in the year.
Print several different versions for a class with the Versions setting; each version has its own answer key page in the same file.
Standards
- Common Core 2.NBT.B.5 — fluently add within 100 using strategies based on place value
- Common Core 1.NBT.C.4 — add within 100 (two-digit plus two-digit)
Questions
What does "regrouping" mean in addition?
When a column adds to 10 or more, you write the ones digit and carry the ten to the next column. It used to be called "carrying".
How many problems should a second grader do?
Twenty is a comfortable daily sheet while the method is new; move to 30 or 50 in 5 minutes once accuracy is above 90%.