Common Core: 2nd Grade Math : Operations & Algebraic Thinking

Study concepts, example questions & explanations for Common Core: 2nd Grade Math

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Example Questions

Example Question #231 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

\displaystyle \frac{\begin{array}[b]{r}16\\ +\ 3\end{array}}{ \ \ \space?}

Possible Answers:

\displaystyle 20

\displaystyle 15

\displaystyle 13

\displaystyle 19

\displaystyle 18

Correct answer:

\displaystyle 19

Explanation:

To add we count up. Start at \displaystyle 16 and count up \displaystyle 3.

\displaystyle 16,17,18,19

\displaystyle \frac{\begin{array}[b]{r}16\\ +\ 3\end{array}}{ \ \ \space19}

Example Question #232 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

\displaystyle \frac{\begin{array}[b]{r}1\\ +\ 5\end{array}}{ \ \ \ \space?}

Possible Answers:

\displaystyle 1

\displaystyle 6

\displaystyle 3

\displaystyle 4

\displaystyle 2

Correct answer:

\displaystyle 6

Explanation:

To add we count up. Start at \displaystyle 1 and count up \displaystyle 5.

\displaystyle 1,2,3,4,5,6

\displaystyle \frac{\begin{array}[b]{r}1\\ +\ 5\end{array}}{ \ \ \ \space6}

Example Question #233 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 6\end{array}}{ \ \ \ \space?}

Possible Answers:

\displaystyle 13

\displaystyle 11

\displaystyle 12

\displaystyle 9

\displaystyle 10

Correct answer:

\displaystyle 9

Explanation:

To add we count up. Start at \displaystyle 3 and count up \displaystyle 6.

\displaystyle 3,4,5,6,7,8,9

\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 6\end{array}}{ \ \ \ \space9}

Example Question #234 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

\displaystyle \frac{\begin{array}[b]{r}7\\ +\ 10\end{array}}{ \ \ \ \space?}

Possible Answers:

\displaystyle 17

\displaystyle 18

\displaystyle 19

\displaystyle 20

\displaystyle 16

Correct answer:

\displaystyle 17

Explanation:

To add we count up. Start at \displaystyle 7 and count up \displaystyle 10.

\displaystyle 7,8,9,10,11,12,13,14,15,16,17

\displaystyle \frac{\begin{array}[b]{r}7\\ +\ 10\end{array}}{ \ \ \ \space17}

Example Question #1631 : Numbers And Operations

\displaystyle \frac{\begin{array}[b]{r}9\\ +\ 11\end{array}}{ \ \ \space?}

Possible Answers:

\displaystyle 16

\displaystyle 17

\displaystyle 19

\displaystyle 18

\displaystyle 20

Correct answer:

\displaystyle 20

Explanation:

To add we count up. Start at \displaystyle 9 and count up \displaystyle 11.

\displaystyle 9,10,11,12,13,14,15,16,17,18,19,20

\displaystyle \frac{\begin{array}[b]{r}9\\ +\ 11\end{array}}{ \ \ \ \space20}

Example Question #1631 : Ssat Elementary Level Quantitative (Math)

\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 8\end{array}}{ \ \ \ \space?}

Possible Answers:

\displaystyle 11

\displaystyle 10

\displaystyle 8

\displaystyle 12

\displaystyle 9

Correct answer:

\displaystyle 11

Explanation:

To add we count up. Start at \displaystyle 3 and count up \displaystyle 8.

\displaystyle 3,4,5,6,7,8,9,10,11

\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 8\end{array}}{ \ \ \space11}

Example Question #1633 : Numbers And Operations

\displaystyle \frac{\begin{array}[b]{r}9\\ +\ 9\end{array}}{ \ \ \ \space?}

Possible Answers:

\displaystyle 16

\displaystyle 18

\displaystyle 17

\displaystyle 15

\displaystyle 14

Correct answer:

\displaystyle 18

Explanation:

To add we count up. Start at \displaystyle 9 and count up \displaystyle 9.

\displaystyle 9,10,11,12,13,14,15,16,17,18

\displaystyle \frac{\begin{array}[b]{r}9\\ +\ 9\end{array}}{ \ \ \space18}

Example Question #1632 : Ssat Elementary Level Quantitative (Math)

\displaystyle \frac{\begin{array}[b]{r}2\\ +\ 4\end{array}}{ \ \ \ \space?}

Possible Answers:

\displaystyle 6

\displaystyle 7

\displaystyle 8

\displaystyle 5

\displaystyle 9

Correct answer:

\displaystyle 6

Explanation:

To add we count up. Start at \displaystyle 2 and count up \displaystyle 4.

\displaystyle 2,3,4,5,6

\displaystyle \frac{\begin{array}[b]{r}2\\ +\ 4\end{array}}{ \ \ \ \space6}

Example Question #235 : Mentally Add And Subtract Within 20: Ccss.Math.Content.2.Oa.B.2

\displaystyle \frac{\begin{array}[b]{r}5\\ +\ 2\end{array}}{ \ \ \ \space?}

Possible Answers:

\displaystyle 4

\displaystyle 3

\displaystyle 6

\displaystyle 7

\displaystyle 5

Correct answer:

\displaystyle 7

Explanation:

To add we count up. Start at \displaystyle 5 and count up \displaystyle 2.

\displaystyle 5,6,7 

\displaystyle \frac{\begin{array}[b]{r}5\\ +\ 2\end{array}}{ \ \ \ \space7}

Example Question #1892 : Common Core Math: Grade 2

\displaystyle \frac{\begin{array}[b]{r}1\\ +\ 13\end{array}}{ \ \ \space?}

Possible Answers:

\displaystyle 12

\displaystyle 10

\displaystyle 14

\displaystyle 11

\displaystyle 9

Correct answer:

\displaystyle 14

Explanation:

To add we count up. Start at \displaystyle 1 and count up \displaystyle 13.

\displaystyle 1,2,3,4,5,6,7,8,9,10,11,12,13,14

\displaystyle \frac{\begin{array}[b]{r}1\\ +\ 13\end{array}}{ \ \ \space14}

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