SSAT Elementary Level Math : How to subtract

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

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Example Questions

Example Question #94 : Adding And Subtracting Within 20

\(\displaystyle \frac{\begin{array}[b]{r}16\\ -\ 1\end{array}}{ \ \ \ \space ?}\)

Possible Answers:

\(\displaystyle 14\)

\(\displaystyle 11\)

\(\displaystyle 15\)

\(\displaystyle 12\)

\(\displaystyle 13\)

Correct answer:

\(\displaystyle 15\)

Explanation:

To subtract we can count backwards. Start at \(\displaystyle 16\) and count back \(\displaystyle 1\).

\(\displaystyle 16,15\)

\(\displaystyle \frac{\begin{array}[b]{r}16\\ -\ 1\end{array}}{ \ \ \space 15}\)

Example Question #95 : Adding And Subtracting Within 20

\(\displaystyle \frac{\begin{array}[b]{r}15\\ -\ 12\end{array}}{ \ \ \ \space ?}\)

Possible Answers:

\(\displaystyle 7\)

\(\displaystyle 6\)

\(\displaystyle 3\)

\(\displaystyle 5\)

\(\displaystyle 4\)

Correct answer:

\(\displaystyle 3\)

Explanation:

To subtract we can count backwards. Start at \(\displaystyle 15\) and count back \(\displaystyle 12\).

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

\(\displaystyle \frac{\begin{array}[b]{r}15\\ -\ 12\end{array}}{ \ \ \ \ \ \space 3}\)

Example Question #96 : Adding And Subtracting Within 20

\(\displaystyle \frac{\begin{array}[b]{r}13\\ -\ 12\end{array}}{ \ \ \ \space ?}\)

Possible Answers:

\(\displaystyle 4\)

\(\displaystyle 1\)

\(\displaystyle 2\)

\(\displaystyle 0\)

\(\displaystyle 3\)

Correct answer:

\(\displaystyle 1\)

Explanation:

To subtract we can count backwards. Start at \(\displaystyle 13\) and count back \(\displaystyle 12\).

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

\(\displaystyle \frac{\begin{array}[b]{r}13\\ -\ 12\end{array}}{ \ \ \ \ \ \space 1}\)

Example Question #97 : Adding And Subtracting Within 20

\(\displaystyle \frac{\begin{array}[b]{r}10\\ -\ 6\end{array}}{ \ \ \ \space ?}\)

Possible Answers:

\(\displaystyle 1\)

\(\displaystyle 4\)

\(\displaystyle 3\)

\(\displaystyle 2\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle 4\)

Explanation:

To subtract we can count backwards. Start at \(\displaystyle 10\) and count back \(\displaystyle 6\).

\(\displaystyle 10, 9, 8, 7, 6, 5, 4\)

\(\displaystyle \frac{\begin{array}[b]{r}10\\ -\ 6\end{array}}{ \ \ \ \space 4}\)

Example Question #98 : Adding And Subtracting Within 20

\(\displaystyle \frac{\begin{array}[b]{r}1\\ -\ 1\end{array}}{ \ \ \ \space ?}\)

Possible Answers:

\(\displaystyle 2\)

\(\displaystyle 0\)

\(\displaystyle 4\)

\(\displaystyle 1\)

\(\displaystyle 3\)

Correct answer:

\(\displaystyle 0\)

Explanation:

To subtract we can count backwards. Start at \(\displaystyle 1\) and count back \(\displaystyle 1\).

\(\displaystyle 1,0\)

\(\displaystyle \frac{\begin{array}[b]{r}1\\ -\ 1\end{array}}{ \ \ \ \space 0}\)

Example Question #99 : Adding And Subtracting Within 20

\(\displaystyle \frac{\begin{array}[b]{r}3\\ -\ 1\end{array}}{ \ \ \ \space ?}\)

Possible Answers:

\(\displaystyle 2\)

\(\displaystyle 1\)

\(\displaystyle 0\)

\(\displaystyle 3\)

\(\displaystyle 4\)

Correct answer:

\(\displaystyle 2\)

Explanation:

To subtract we can count backwards. Start at \(\displaystyle 3\) and count back \(\displaystyle 1\).

\(\displaystyle 3,2\)

\(\displaystyle \frac{\begin{array}[b]{r}3\\ -\ 1\end{array}}{ \ \ \ \space 2}\)

Example Question #100 : Adding And Subtracting Within 20

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

Possible Answers:

\(\displaystyle 6\)

\(\displaystyle 3\)

\(\displaystyle 5\)

\(\displaystyle 7\)

\(\displaystyle 4\)

Correct answer:

\(\displaystyle 3\)

Explanation:

To subtract we can count backwards. Start at \(\displaystyle 6\) and count back \(\displaystyle 3\).

\(\displaystyle 6,5,4,3\)

\(\displaystyle \frac{\begin{array}[b]{r}6\\ -\ 3\end{array}}{ \ \ \ \space 3}\)

Example Question #101 : Adding And Subtracting Within 20

\(\displaystyle \frac{\begin{array}[b]{r}20\\ -\ 11\end{array}}{ \ \ \ \ \ \space ?}\)

Possible Answers:

\(\displaystyle 11\)

\(\displaystyle 10\)

\(\displaystyle 13\)

\(\displaystyle 12\)

\(\displaystyle 9\)

Correct answer:

\(\displaystyle 9\)

Explanation:

To subtract we can count backwards. Start at \(\displaystyle 20\) and count back \(\displaystyle 11\).

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

\(\displaystyle \frac{\begin{array}[b]{r}20\\ -\ 11\end{array}}{ \ \ \ \ \ \space 9}\)

Example Question #102 : Adding And Subtracting Within 20

\(\displaystyle \frac{\begin{array}[b]{r}19\\ -\ 12\end{array}}{ \ \ \ \ \ \space ?}\)

Possible Answers:

\(\displaystyle 6\)

\(\displaystyle 4\)

\(\displaystyle 3\)

\(\displaystyle 7\)

\(\displaystyle 5\)

Correct answer:

\(\displaystyle 7\)

Explanation:

To subtract we can count backwards. Start at \(\displaystyle 19\) and count back \(\displaystyle 12\).

\(\displaystyle 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7\)

\(\displaystyle \frac{\begin{array}[b]{r}19\\ -\ 12\end{array}}{ \ \ \ \ \ \space 7}\)

Example Question #103 : Adding And Subtracting Within 20

\(\displaystyle \frac{\begin{array}[b]{r}18\\ -\ 16\end{array}}{ \ \ \ \ \ \space ?}\)

Possible Answers:

\(\displaystyle 3\)

\(\displaystyle 4\)

\(\displaystyle 1\)

\(\displaystyle 5\)

\(\displaystyle 2\)

Correct answer:

\(\displaystyle 2\)

Explanation:

To subtract we can count backwards. Start at \(\displaystyle 18\) and count back \(\displaystyle 16\).

\(\displaystyle 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2\)

\(\displaystyle \frac{\begin{array}[b]{r}18\\ -\ 16\end{array}}{ \ \ \ \ \ \space 2}\)

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