# Common Core: 2nd Grade Math : Mentally Add and Subtract Within 20: CCSS.Math.Content.2.OA.B.2

## Example Questions

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### Example Question #1 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Explanation:

To subtract we can count backwards. Start at  and count back

### Example Question #2 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Explanation:

To subtract we can count backwards. Start at  and count back

### Example Question #3 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Explanation:

To subtract we can count backwards. Start at  and count back

### Example Question #4 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Explanation:

To subtract we can count backwards. Start at  and count back .

### Example Question #5 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Explanation:

To subtract we can count backwards. Start at  and count back .

### Example Question #6 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Explanation:

To subtract we can count backwards. Start at  and count back .

### Example Question #7 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Explanation:

To subtract we can count backwards. Start at  and count back .

### Example Question #8 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Explanation:

To subtract we can count backwards. Start at  and count back .

### Example Question #9 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

Explanation:

To subtract we can count backwards. Start at  and count back