Common Core: 3.NBT
Answer Key
Grade 3additionChallenging

3-Digit Addition with Regrouping (Set A)

Regroup with 3-digit numbers

8 problems

1.
375
+ 717
____
2.
411
+569
___
3.
365
+100
___
4.
483
+274
___
5.
519
+126
___
6.
554
+ 878
____
7.
590
+ 731
____
8.
626
+ 583
____