Add the ones, then the tens, then the hundreds. When a place adds up to 10 or more, carry a 1 to the next place.
Worked example
181 + 114 = ?
Answer:295
Add one place at a time, starting with the ones. When a place adds up to 10 or more, carry a 1 to the next place. 181 + 114 = 295.
1
8
1
+
1
1
4
2
9
5
For grown-ups: Fluently add/subtract within 1,000. Below: three problems to try with the worked answers, and a free printable sheet. Children can practise the same skill as a game, with no sign-up and no ads.
CCSS 3.NBT.A.2
What this practises, for teachers
Practices fluently add/subtract within 1,000 (3.NBT.A.2). A printable sheet with its answer key, worked answers on the page, no accounts.