SSAT Elementary Level Math : How to add

Study concepts, example questions & explanations for SSAT Elementary Level Math

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Example Questions

Example Question #381 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

\(\displaystyle \frac{\begin{array}[b]{r}10\\ +\ 3\end{array}}{ \ \ \space?}\)

Possible Answers:

\(\displaystyle 13\)

\(\displaystyle 17\)

\(\displaystyle 16\)

\(\displaystyle 14\)

\(\displaystyle 15\)

Correct answer:

\(\displaystyle 13\)

Explanation:

To add we count up. Start at \(\displaystyle 10\) and count up \(\displaystyle 3\).

\(\displaystyle 10,11,12,13\)

\(\displaystyle \frac{\begin{array}[b]{r}10\\ +\ 3\end{array}}{ \ \ \space13}\)

Example Question #382 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

\(\displaystyle \frac{\begin{array}[b]{r}17\\ +\ 3\end{array}}{ \ \ \space?}\)

Possible Answers:

\(\displaystyle 19\)

\(\displaystyle 16\)

\(\displaystyle 18\)

\(\displaystyle 17\)

\(\displaystyle 20\)

Correct answer:

\(\displaystyle 20\)

Explanation:

To add we count up. Start at \(\displaystyle 17\) and count up \(\displaystyle 3\).

\(\displaystyle 17,18,19,20\)

\(\displaystyle \frac{\begin{array}[b]{r}17\\ +\ 3\end{array}}{ \ \ \space20}\)

Example Question #383 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

\(\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 15\end{array}}{ \ \ \space?}\)

Possible Answers:

\(\displaystyle 15\)

\(\displaystyle 14\)

\(\displaystyle 17\)

\(\displaystyle 18\)

\(\displaystyle 16\)

Correct answer:

\(\displaystyle 18\)

Explanation:

To add we count up. Start at \(\displaystyle 3\) and count up \(\displaystyle 15\)

\(\displaystyle 3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18\)

\(\displaystyle \frac{\begin{array}[b]{r}3\\ +\ 15\end{array}}{ \ \ \ \space18}\)

Example Question #384 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

\(\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 4\end{array}}{ \ \ \space?}\)

Possible Answers:

\(\displaystyle 8\)

\(\displaystyle 11\)

\(\displaystyle 10\)

\(\displaystyle 12\)

\(\displaystyle 9\)

Correct answer:

\(\displaystyle 12\)

Explanation:

To add we count up. Start at \(\displaystyle 8\) and count up \(\displaystyle 4\).

\(\displaystyle 8,9,10,11,12\)

\(\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 4\end{array}}{ \ \ \space12}\)

Example Question #385 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

\(\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 4\end{array}}{ \ \ \space?}\)

Possible Answers:

\(\displaystyle 10\)

\(\displaystyle 8\)

\(\displaystyle 12\)

\(\displaystyle 9\)

\(\displaystyle 11\)

Correct answer:

\(\displaystyle 12\)

Explanation:

To add we count up. Start at \(\displaystyle 8\) and count up \(\displaystyle 4\).

\(\displaystyle 8,9,10,11,12\)

\(\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 4\end{array}}{ \ \ \space12}\)

Example Question #386 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

\(\displaystyle \frac{\begin{array}[b]{r}15\\ +\ 5\end{array}}{ \ \ \space?}\)

Possible Answers:

\(\displaystyle 16\)

\(\displaystyle 17\)

\(\displaystyle 18\)

\(\displaystyle 20\)

\(\displaystyle 19\)

Correct answer:

\(\displaystyle 20\)

Explanation:

To add we count up. Start at \(\displaystyle 15\) and count up \(\displaystyle 5\).

\(\displaystyle 15,16,17,18,19,20\)

\(\displaystyle \frac{\begin{array}[b]{r}15\\ +\ 5\end{array}}{ \ \ \space20}\)

Example Question #387 : Adding And Subtracting Within 20: Ccss.Math.Content.1.Oa.C.6

\(\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 5\end{array}}{ \ \ \space?}\)

Possible Answers:

\(\displaystyle 14\)

\(\displaystyle 13\)

\(\displaystyle 12\)

\(\displaystyle 15\)

\(\displaystyle 11\)

Correct answer:

\(\displaystyle 13\)

Explanation:

To add we count up. Start at \(\displaystyle 8\) and count up \(\displaystyle 5\).

\(\displaystyle 8,9,10,11,12,13\)

\(\displaystyle \frac{\begin{array}[b]{r}8\\ +\ 5\end{array}}{ \ \ \space13}\)

Example Question #1301 : How To Add

\(\displaystyle \frac{\begin{array}[b]{r}15\\ +\ 10\end{array}}{ \ \ \space}\)

Possible Answers:

\(\displaystyle 30\)

\(\displaystyle 35\)

\(\displaystyle 25\)

\(\displaystyle 10\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle 25\)

Explanation:

When we add \(\displaystyle 10\) to a two digit number, the only number that changes in our answer is the tens position, and it will always go up by \(\displaystyle 1\). Mentally, we can add \(\displaystyle 1\) to the number in the tens place to find our answer. 

\(\displaystyle 1+1=2\)

\(\displaystyle \frac{\begin{array}[b]{r}15\\ +\ 10\end{array}}{ \ \ \ \ \space25}\)

Example Question #1302 : How To Add

\(\displaystyle \frac{\begin{array}[b]{r}10\\ +\ 10\end{array}}{ \ \ \space}\)

 

Possible Answers:

\(\displaystyle 20\)

\(\displaystyle 0\)

\(\displaystyle 30\)

\(\displaystyle 5\)

\(\displaystyle 10\)

Correct answer:

\(\displaystyle 20\)

Explanation:

When we add \(\displaystyle 10\) to a two digit number, the only number that changes in our answer is the tens position, and it will always go up by \(\displaystyle 1\). Mentally, we can add \(\displaystyle 1\) to the number in the tens place to find our answer. 

\(\displaystyle 1+1=2\)

\(\displaystyle \frac{\begin{array}[b]{r}10\\ +\ 10\end{array}}{ \ \ \ \space20}\)

Example Question #12 : Place Value And Properties Of Operations To Add And Subtract

\(\displaystyle \frac{\begin{array}[b]{r}20\\ +\ 10\end{array}}{ \ \ \space}\)

 

Possible Answers:

\(\displaystyle 15\)

\(\displaystyle 5\)

\(\displaystyle 30\)

\(\displaystyle 40\)

\(\displaystyle 10\)

Correct answer:

\(\displaystyle 30\)

Explanation:

When we add \(\displaystyle 10\) to a two digit number, the only number that changes in our answer is the tens position, and it will always go up by \(\displaystyle 1\). Mentally, we can add \(\displaystyle 1\) to the number in the tens place to find our answer. 

\(\displaystyle 2+1=3\)

\(\displaystyle \frac{\begin{array}[b]{r}20\\ +\ 10\end{array}}{ \ \ \ \space30}\)

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