PLUS ZERO FACTS Association of adding zero with making no change to the other addend. Introduce with story problems that would be represented by the addition of zero. For example, I had 5 cookies. I met my friend who would not give me any more cookies. How many cookies did I have after I met my friend? (Telling the same story with the friend giving 3 cookies and writing the appropriate number sentence, then 2 cookies, and 1 cookie before the 0 cookies would help underscore the addition sentence with zero.) When reinforced in isolation, these facts are not problematic; however, when integrated with other facts, some students treat them as if they were plus-one facts because they over generalize that addition is an action that makes a larger quantity and are reluctant to record no change as a result. Consequently, you will probably not have to spend much time reinforcing these 19 facts in isolation; rather, more time should be spent reinforcing the total of 70 facts. Examples: 9 + 0 0 more than 3 $6 collected on Monday and $0 on Tuesday. How much altogether? 0 and 0 more 0 oatmeal cookies and 5 chocolate chip cookies. How many cookies? 8 increased by zero

6-0

5+0

0+4

0+0

0+9

0+8

8-0

1+0

2+0

4+0

1-0

9+0

4-0

2-0

0+3

0+2

0+6

5-0

9-0

7+0

7-0

0+5

0-0

3-0

8+0

0+1

3+0

0+7

6+0