To find the sum of three-digit numbers, first add the ones.
2
4
3
6
1
4
+ _____
7
Then add the tens.
2
4
3
6
1
4
+ _____
5
7
Then add the hundreds.
2
4
3
6
1
4
+ _____
8
5
7
Practice adding three digit numbers. Fill in the boxes below.
1
3
5
4
2
0
+
_____
5
5
4
3
7
3
5
2
+
_____
7
7
5
6
1
4
3
+
_____
1
2
8
3
4
1
+
_____
2
9
3
3
0
6
+
_____
1
8
4
6
1
5
+
_____
2
2
7
3
5
2
+
_____
1
9
3
6
0
6
+
_____
4
2
7
5
6
2
+
_____
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