Show:
Plus Zero
Counting on +1, +2, +3
?? Mystery ??
Doubles
Doubles Plus 1
100

2 + 0 =

2 + 0 = 2

100

4 + 1 =

4 + 1 = 5

100

1 + 9 =

1 + 9 = 10

100

2 + 2 = 

2 + 2 = 4

100

3 + 4 = 

3 + 3 = 6,  so 3 + 4 = 7

200

0 + 5 =

0 + 5 = 5

200

4 + 2 =

4 + 2 = 6

200

8 + 2 =

8 + 2 = 10

200

4 + 4 =

4 + 4 = 8

200

4 + 5 =

4 + 4 = 8, so 4 + 5 = 9

300

10 + 0 =

10 + 0 = 10

300

6 + 2 =

6 + 2 = 8

300

3 + 7 =

3 + 7 = 10

300

6 + 6 =

6 + 6 = 12

300

5 + 6 = 

5 + 5 = 10, so 5 + 6 = 11

400

0 + 19 =

0 + 19 = 19

400

6 + 3 =

6 + 3 = 9

400

6 + 4 =

6 + 4 = 10

400
8 + 8 =

8 + 8 = 16

400

7 + 6 =

6 + 6 = 12, so 7 + 6 = 13

500

147 + 0 =

147 + 0 =

500

3 + 5 = 

3 + 5 = 8

500

2 + 8 =

2 + 8 = 10

500

9 + 9 =

9 + 9 = 18

500

8 + 7 =

7 + 7 = 14, so 8 + 7 = 15