Addition with regrouping, step by step
Regrouping — carrying a ten to the next column.
The question
12 + 38
12=10+2
38=30+8
10+30=40
2+8=10
40+10=50
- 12 + 38, written across the line — so split each one into its tens and its ones, and add like with like.
- The tens together: 10 + 30 = 40.
- The ones together: 2 + 8 = 10. That is over ten, which is fine — it is a whole ten and some more, and it goes back in as one.
- Put the two parts back together: 40 + 10 = 50.
How it works.
- 01
12 + 38, written across the line — so split each one into its tens and its ones, and add like with like.
- 02
The tens together: 10 + 30 = 40.
- 03
The ones together: 2 + 8 = 10. That is over ten, which is fine — it is a whole ten and some more, and it goes back in as one.
- 04
Put the two parts back together: 40 + 10 = 50.