Math Message:Math Message:

1) Make Ballpark Estimations 1) Make Ballpark Estimations for for

56 + 7956 + 79

891 + 213891 + 213

2) Play Estimation Tic-Tac-Toe 2) Play Estimation Tic-Tac-Toe with someone at your with someone at your tabletable

Column-Addition MethodColumn-Addition Method

SRB page 11SRB page 11

Column Addition MethodColumn Addition Method

1.1. Draw lines to separate the 1’s, 10’s Draw lines to separate the 1’s, 10’s and 100’s placesand 100’s places

2.2. Add the numbers in each column. Add the numbers in each column. Write each sum in its columnWrite each sum in its column

3.3. If there are 2-digits in the 1’s place, If there are 2-digits in the 1’s place, trade 10 ones for 1 tentrade 10 ones for 1 ten

4.4. If there are 2 digits in the 10’s place, If there are 2 digits in the 10’s place, trade 10 tens for 1 hundredtrade 10 tens for 1 hundred

Column-Addition MethodColumn-Addition Method

Check Your Understanding Check Your Understanding

1.1. 327327

+ 252+ 252

579

2. 67 + 45

112

1

Addition GamesAddition Games

Ghost BlastersGhost Blasters

2-Digit2-Digit

3-Digits3-Digits

11) Math Journal pages 42-43) Math Journal pages 42-43

2) Play Tic-Tac-Toe Addition2) Play Tic-Tac-Toe Addition

3) Math Boxes 2.4-2.73) Math Boxes 2.4-2.7