1. Adding Two and Three Digit Numbers
Column Method
&
Partial Sum Method

2. Lesson Column Addition 100’s 10’s 1’s 7+4= 11
*Step 1.. Add the 1’s column
100’s ’s ’s = 11
*Step 2.. Add the 10’s column
= *Step 3.. Add the 100’s column =3

3. 3 5 7 + 6 4 *Step 4.. Trade 10 of your ones for ten.
100’s ’s ’s
*Step 4.. Trade 10 of your ones for ten.
You now have 12 tens, 1 one and 3 hundreds *Step 5.. Now have 1 one and 12 tens Trade 10 of your tens and add to your hundreds.
So when adding using the column method, we found the answer is 421. 3 11 11 3 12 1 4 2 1

4. Lesson Partial Sum Method 60+40 = 100 Step 3.. Add 100+10 =110
Step 1.. Add your tens first Step 2.. Next, add your ones.
60+40 = Step 3.. Add =110
6+4 = The solution to the problem
= 110