Addition with 3 or more addends:1.Add the numbers

vertically

2. Make sure that all numbers are lined up in the correct place:

TH ,H T O 458

789

+ 312

1,559

Example:

Try, Guess and Check Problem Solving:Method for when the numbers are low and easy to

tally: 1) Tally circle method

The Red Sox beat the Cubs by 9 runs in a baseball game Saturday. There were 19 runs scored in the game. What was the final score of the game?

Use the tally method to figure this our. Draw 2 circles – one for each team.

1st tally the 9 runs at the top of one circle for the number of runs that the team won by.

Then start counting at the 10 and put a tally in a circle and tally # 11 in the other circle and continue back and forth until you reach the total number of runs scored in the game. (19) Now total the tallies in the circles and you will have the score of the game.

Score: 14 to 5. Red Sox had 14 runs

Method for when numbers are too high to tally:

2) Guess and Check Chart

The Hawks beat the Jays in a baseball game. The scores were 6 runs apart and there were 48 runs scored in the game. How many runs did each team score?

Make a Guess and Check Chart. Put the losing team in the first column. In the second column, you add 6 to the original guess because the team won by 6 runs. Make a guess at the Jays’ scores and complete the chart until you get the sum of the scores correct.

Jays Hawks (Jays +6) Sum of both scores= 48 guess right?

20 26 20 + 26 = 46 Guess too low

25

21

31

27

25 + 31 = 56

21 + 27 = 48

Guess too high

Right!

When you get the correct answer you will know the scores.

Jays 21 and Hawks 27

Working Together:1.

75

36

+ 58

2.

524

97

+ 176

3.

273

187

64

+ 249

Working Together:

4. Charlie has been collecting stamps in September and October. He has collected a total of 29. He collected 15 more in October than September. How many stamps did he collect each month?

Working Together:

5. The Hawks beat the Jays in a baseball game. The scores were 6 runs apart and there were 22 runs scored in the game. How many runs did each team score?

Working Together:

6. The sum of two numbers is 65. The numbers are 3 apart. What are they?

On My Own:

7. 142

297

+ 116

8. 319

48

136

+ 347

Johnny and Mitch have a total of 32 baseball cards. Mitch has two more than Johnny. How many cards does each boy have?

9.

On My Own:

10. The Hawks lost to the Orioles by 4 runs.

There were 18 runs scored in the game. How many runs did the Orioles score?

The Jays beat the Orioles by 8 runs. There were 16 runs scored in the game. How many runs did the Jays score?

11.