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2nd Grade Math : Operations

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

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Example Questions

Example Question #3 : 2nd Grade Math

Solve:

$\frac{\begin{array}[b]{r}642\\ -\ 100\end{array}}{ \ \ \ \space }$ $\displaystyle \frac{\begin{array}[b]{r}642\\ -\ 100\end{array}}{ \ \ \ \space }$

Possible Answers:

500 $\displaystyle 500$

742 $\displaystyle 742$

600 $\displaystyle 600$

542 $\displaystyle 542$

Correct answer:

542 $\displaystyle 542$

Explanation:

When subtracting any number by 100 $\displaystyle 100$ the only number that will change in your answer is the hundreds place.

2-0=2 $\displaystyle 2-0=2$

4-0=4 $\displaystyle 4-0=4$

5-1=5 $\displaystyle 5-1=5$

$\frac{\begin{array}[b]{r}642\\ -\ 100\end{array}}{ \ \ \ \space 542}$ $\displaystyle \frac{\begin{array}[b]{r}642\\ -\ 100\end{array}}{ \ \ \ \space 542}$

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Example Question #1 : Operations

The pet store has $\displaystyle 48$ goldfish in a tank. A teacher bought $\displaystyle 10$ goldfish for her school’s fish tank. How many goldfish does the pet store have left?

Possible Answers:

$\displaystyle 30$

$\displaystyle 38$

$\displaystyle 58$

$\displaystyle 50$

Correct answer:

$\displaystyle 38$

Explanation:

This is a subtraction problem because we want to know how many goldfish the pet store has left over after the teacher buys the first and takes them away from the store. We take the number of goldfish that the store had and then subtract the number that the teacher bought.

$\frac{\begin{array}[b]{r}48\\ -\ 10\end{array}}{ \ \ \ \space 38}$ $\displaystyle \frac{\begin{array}[b]{r}48\\ -\ 10\end{array}}{ \ \ \ \space 38}$

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Example Question #5 : 2nd Grade Math

David is $23\textup{ inches}$ $\displaystyle 23\textup{ inches}$ taller than Alison. Alison is $53\textup{ inches}$ $\displaystyle 53\textup{ inches}$ tall. How tall is David?

Possible Answers:

$82\textup{ inches}$ $\displaystyle 82\textup{ inches}$

$80\textup{ inches}$ $\displaystyle 80\textup{ inches}$

$76\textup{ inches}$ $\displaystyle 76\textup{ inches}$

$84\textup{ inches}$ $\displaystyle 84\textup{ inches}$

Correct answer:

$76\textup{ inches}$ $\displaystyle 76\textup{ inches}$

Explanation:

This is an addition problem because we have the difference in height from the question. Alison is $\displaystyle 53$ inches tall and David is $\displaystyle 23$ inches taller than her, $\displaystyle 23$ is our difference. We can add our difference to Alison's height to find out how tall David is.

$\frac{\begin{array}[b]{r}53\\ +\ 23\end{array}}{ \ \ \ \space 76}$ $\displaystyle \frac{\begin{array}[b]{r}53\\ +\ 23\end{array}}{ \ \ \ \space 76}$

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2nd Grade Math : Operations

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

All 2nd Grade Math Resources

Example Questions

Example Question #3 : 2nd Grade Math

Example Question #1 : Operations

Example Question #5 : 2nd Grade Math

All 2nd Grade Math Resources

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