Common Core: 2nd Grade Math : Number & Operations in Base Ten

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

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Example Questions

Example Question #5 : Count Within 1000 By 1s, 5s, 10s, And 100s, Ccss.Math.Content.2.Nbt.A.2

What is the missing number? \(\displaystyle 300,\)__________, \(\displaystyle 500, 600, 700\)

Possible Answers:

\(\displaystyle 399\)

\(\displaystyle 301\)

\(\displaystyle 400\)

\(\displaystyle 200\)

\(\displaystyle 800\)

Correct answer:

\(\displaystyle 400\)

Explanation:

In this series we are counting by \(\displaystyle 100\). When counting by \(\displaystyle 100\), \(\displaystyle 400\) is between \(\displaystyle 300\) and \(\displaystyle 500\)

Example Question #6 : Count Within 1000 By 1s, 5s, 10s, And 100s, Ccss.Math.Content.2.Nbt.A.2

What is the missing number? \(\displaystyle 40,\)__________,\(\displaystyle 60, 70, 80\)

Possible Answers:

\(\displaystyle 45\)

\(\displaystyle 30\)

\(\displaystyle 90\)

\(\displaystyle 50\)

\(\displaystyle 55\)

Correct answer:

\(\displaystyle 50\)

Explanation:

In this series we are counting by \(\displaystyle 10\). When counting by \(\displaystyle 10\), \(\displaystyle 50\) is in between \(\displaystyle 40\) and \(\displaystyle 60\)

Example Question #7 : Count Within 1000 By 1s, 5s, 10s, And 100s, Ccss.Math.Content.2.Nbt.A.2

What is the missing number? \(\displaystyle 100\)\(\displaystyle 200\), __________, \(\displaystyle 400\)\(\displaystyle 500\) 

Possible Answers:

\(\displaystyle 399\)

\(\displaystyle 300\)

\(\displaystyle 301\)

\(\displaystyle 201\)

\(\displaystyle 3\textup,000\)

Correct answer:

\(\displaystyle 300\)

Explanation:

In this series we are counting by \(\displaystyle 100\). When counting by \(\displaystyle 100\)\(\displaystyle 300\) is between \(\displaystyle 200\) and \(\displaystyle 400\)

Example Question #8 : Count Within 1000 By 1s, 5s, 10s, And 100s, Ccss.Math.Content.2.Nbt.A.2

What is the missing number? \(\displaystyle 310\)\(\displaystyle 320\)\(\displaystyle 330\)__________\(\displaystyle 350\)

Possible Answers:

\(\displaystyle 360\)

\(\displaystyle 340\)

\(\displaystyle 349\)

\(\displaystyle 331\)

\(\displaystyle 335\)

Correct answer:

\(\displaystyle 340\)

Explanation:

In this series we are counting by \(\displaystyle 10\). When counting by \(\displaystyle 10\), \(\displaystyle 340\) is between \(\displaystyle 330\) and \(\displaystyle 350\)

Example Question #511 : Number & Operations In Base Ten

When counting by \(\displaystyle 5\)s, what number comes after \(\displaystyle 120?\)

 

Possible Answers:

\(\displaystyle 110\)

\(\displaystyle 125\)

\(\displaystyle 105\)

\(\displaystyle 115\)

\(\displaystyle 100\)

Correct answer:

\(\displaystyle 125\)

Explanation:

When counting by \(\displaystyle 5\)s, we add \(\displaystyle 5\) to our previous number. 

\(\displaystyle \frac{\begin{array}[b]{r}120\\ +\ 5\end{array}}{ \ \space 125}\)

Example Question #12 : Count Within 1000 By 1s, 5s, 10s, And 100s, Ccss.Math.Content.2.Nbt.A.2

When counting by \(\displaystyle 5\)s, what number comes after \(\displaystyle 110?\)

 

Possible Answers:

\(\displaystyle 115\)

\(\displaystyle 120\)

\(\displaystyle 125\)

\(\displaystyle 130\)

\(\displaystyle 105\)

Correct answer:

\(\displaystyle 115\)

Explanation:

When counting by \(\displaystyle 5\)s, we add \(\displaystyle 5\) to our previous number. 

\(\displaystyle \frac{\begin{array}[b]{r}110\\ +\ 5\end{array}}{ \ \space 115}\)

Example Question #13 : Count Within 1000 By 1s, 5s, 10s, And 100s, Ccss.Math.Content.2.Nbt.A.2

When counting by \(\displaystyle 5\)s, what number comes after \(\displaystyle 100?\)

 

Possible Answers:

\(\displaystyle 95\)

\(\displaystyle 90\)

\(\displaystyle 115\)

\(\displaystyle 105\)

\(\displaystyle 110\)

Correct answer:

\(\displaystyle 105\)

Explanation:

When counting by \(\displaystyle 5\)s, we add \(\displaystyle 5\) to our previous number. 

\(\displaystyle \frac{\begin{array}[b]{r}100\\ +\ 5\end{array}}{ \ \space 105}\)

Example Question #14 : Count Within 1000 By 1s, 5s, 10s, And 100s, Ccss.Math.Content.2.Nbt.A.2

When counting by \(\displaystyle 5\)s, what number comes after \(\displaystyle 90?\)

 

Possible Answers:

\(\displaystyle 95\)

\(\displaystyle 80\)

\(\displaystyle 75\)

\(\displaystyle 85\)

\(\displaystyle 100\)

Correct answer:

\(\displaystyle 95\)

Explanation:

When counting by \(\displaystyle 5\)s, we add \(\displaystyle 5\) to our previous number. 

\(\displaystyle \frac{\begin{array}[b]{r}90\\ +\ 5\end{array}}{ \ \ \space 95}\)

Example Question #12 : Count Within 1000 By 1s, 5s, 10s, And 100s, Ccss.Math.Content.2.Nbt.A.2

When counting by \(\displaystyle 5\)s, what number comes after \(\displaystyle 80?\)

 

Possible Answers:

\(\displaystyle 100\)

\(\displaystyle 90\)

\(\displaystyle 95\)

\(\displaystyle 85\)

\(\displaystyle 75\)

Correct answer:

\(\displaystyle 85\)

Explanation:

When counting by \(\displaystyle 5\)s, we add \(\displaystyle 5\) to our previous number. 

\(\displaystyle \frac{\begin{array}[b]{r}80\\ +\ 5\end{array}}{ \ \ \space 85}\)

Example Question #15 : Count Within 1000 By 1s, 5s, 10s, And 100s, Ccss.Math.Content.2.Nbt.A.2

When counting by \(\displaystyle 5\)s, what number comes after \(\displaystyle 70?\)

 

Possible Answers:

\(\displaystyle 55\)

\(\displaystyle 50\)

\(\displaystyle 65\)

\(\displaystyle 75\)

\(\displaystyle 60\)

Correct answer:

\(\displaystyle 75\)

Explanation:

When counting by \(\displaystyle 5\)s, we add \(\displaystyle 5\) to our previous number. 

\(\displaystyle \frac{\begin{array}[b]{r}70\\ +\ 5\end{array}}{ \ \ \space 75}\)

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