Common Core: 3.NBT
Answer Key
Grade 3additionChallenging

3-Digit Addition with Regrouping (Set C)

Additional 3-digit regrouping

8 problems

1.
365
+100
___
2.
483
+274
___
3.
519
+126
___
4.
554
+ 878
____
5.
590
+ 731
____
6.
626
+ 583
____
7.
161
+100
___
8.
698
+287
___