3rd Grade Math Centers

3 - Digit Addition Split

Materials: Addition Split Board (3-digit + 3-digit)

1. Choose a line of four problems from the Addition Split board

(vertically, horizontally, or diagonally).

2. Solve each problem by decomposing the addends into hundreds,

tens and ones before adding. Show your work.

100 + 40 + 6

Example 1: + 200 + 30 + 5

300 + 70 + 11 = 381

146 + 235

186 + 235

100 + 80 + 6

+ 200 + 30 + 5

300 +110 +11 = 421

Example 2:

3. Repeat with another line of four problems.