Common Core: 3rd Grade Math : Round Numbers to the Nearest Ten or Hundred: CCSS.Math.Content.3.NBT.A.1

Study concepts, example questions & explanations for Common Core: 3rd Grade Math

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Example Questions

Example Question #1 : Understanding Place Value And Properties Of Operations For Multi Digit Arithmetic

What is \(\displaystyle 932\) rounded to the nearest hundred? 

 

 

Possible Answers:

\(\displaystyle 700\)

\(\displaystyle 800\)

\(\displaystyle 900\)

\(\displaystyle 720\)

\(\displaystyle 820\)

Correct answer:

\(\displaystyle 900\)

Explanation:

When we round a number to the hundreds place we look to our tens place to tell us if we round up or down. If the number in our tens place is \(\displaystyle 5\) or greater, we round up. If the number in the tens place is \(\displaystyle 4\) or less, we round down. When we round up, the number in the hundreds place increases by \(\displaystyle 1\) and all the other numbers become \(\displaystyle 0\). When we round down, the number in the hundreds place stays the same and all the other numbers become \(\displaystyle 0\).

In this case, \(\displaystyle 3\) is less than \(\displaystyle 5\) so our rounded number is \(\displaystyle 900.\)

Example Question #1 : Number & Operations In Base Ten

What is \(\displaystyle 721\) rounded to the nearest hundred? 

 

 

Possible Answers:

\(\displaystyle 720\)

\(\displaystyle 600\)

\(\displaystyle 620\)

\(\displaystyle 800\)

\(\displaystyle 700\)

Correct answer:

\(\displaystyle 700\)

Explanation:

When we round a number to the hundreds place we look to our tens place to tell us if we round up or down. If the number in our tens place is \(\displaystyle 5\) or greater, we round up. If the number in the tens place is \(\displaystyle 4\) or less, we round down. When we round up, the number in the hundreds place increases by \(\displaystyle 1\) and all the other numbers become \(\displaystyle 0\). When we round down, the number in the hundreds place stays the same and all the other numbers become \(\displaystyle 0\).

In this case, \(\displaystyle 2\) is less than \(\displaystyle 5\) so our rounded number is \(\displaystyle 700\).

Example Question #2 : Number & Operations In Base Ten

What is \(\displaystyle 818\) rounded to the nearest hundred? 

 

 

 

Possible Answers:

\(\displaystyle 800\)

\(\displaystyle 810\)

\(\displaystyle 900\)

\(\displaystyle 700\)

\(\displaystyle 910\)

Correct answer:

\(\displaystyle 800\)

Explanation:

When we round a number to the hundreds place we look to our tens place to tell us if we round up or down. If the number in our tens place is \(\displaystyle 5\) or greater, we round up. If the number in the tens place is \(\displaystyle 4\) or less, we round down. When we round up, the number in the hundreds place increases by \(\displaystyle 1\) and all the other numbers become \(\displaystyle 0\). When we round down, the number in the hundreds place stays the same and all the other numbers become \(\displaystyle 0\).

In this case, \(\displaystyle 1\) is less than \(\displaystyle 5\) so our rounded number is \(\displaystyle 800.\)

Example Question #3 : Number & Operations In Base Ten

What is \(\displaystyle 644\) rounded to the nearest hundred? 

 

Possible Answers:

\(\displaystyle 500\)

\(\displaystyle 600\)

\(\displaystyle 640\)

\(\displaystyle 540\)

\(\displaystyle 700\)

Correct answer:

\(\displaystyle 600\)

Explanation:

When we round a number to the hundreds place we look to our tens place to tell us if we round up or down. If the number in our tens place is \(\displaystyle 5\) or greater, we round up. If the number in the tens place is \(\displaystyle 4\) or less, we round down. When we round up, the number in the hundreds place increases by \(\displaystyle 1\) and all the other numbers become \(\displaystyle 0\). When we round down, the number in the hundreds place stays the same and all the other numbers become \(\displaystyle 0\).

In this case, \(\displaystyle 4\) is less than \(\displaystyle 5\) so our rounded number is \(\displaystyle 600\)

Example Question #2 : Round Numbers To The Nearest Ten Or Hundred: Ccss.Math.Content.3.Nbt.A.1

What is \(\displaystyle 534\) rounded to the nearest hundred? 

 

 

Possible Answers:

\(\displaystyle 500\)

\(\displaystyle 600\)

\(\displaystyle 530\)

\(\displaystyle 601\)

\(\displaystyle 630\)

Correct answer:

\(\displaystyle 500\)

Explanation:

When we round a number to the hundreds place we look to our tens place to tell us if we round up or down. If the number in our tens place is \(\displaystyle 5\) or greater, we round up. If the number in the tens place is \(\displaystyle 4\) or less, we round down. When we round up, the number in the hundreds place increases by \(\displaystyle 1\) and all the other numbers become \(\displaystyle 0\). When we round down, the number in the hundreds place stays the same and all the other numbers become \(\displaystyle 0\).

In this case, \(\displaystyle 3\) is less than \(\displaystyle 5\) so our rounded number is \(\displaystyle 500.\)

Example Question #1 : Round Numbers To The Nearest Ten Or Hundred: Ccss.Math.Content.3.Nbt.A.1

What is \(\displaystyle 403\) rounded to the nearest hundred? 

 

 

 

Possible Answers:

\(\displaystyle 410\)

\(\displaystyle 300\)

\(\displaystyle 401\)

\(\displaystyle 400\)

\(\displaystyle 500\)

Correct answer:

\(\displaystyle 400\)

Explanation:

When we round a number to the hundreds place we look to our tens place to tell us if we round up or down. If the number in our tens place is \(\displaystyle 5\) or greater, we round up. If the number in the tens place is \(\displaystyle 4\) or less, we round down. When we round up, the number in the hundreds place increases by \(\displaystyle 1\) and all the other numbers become \(\displaystyle 0\). When we round down, the number in the hundreds place stays the same and all the other numbers become \(\displaystyle 0\).

In this case, \(\displaystyle 0\) is less than \(\displaystyle 5\) so our rounded number is \(\displaystyle 400.\)

Example Question #2 : Understanding Place Value And Properties Of Operations For Multi Digit Arithmetic

What is \(\displaystyle 187\) rounded to the nearest hundred? 

 

 

 

Possible Answers:

\(\displaystyle 200\)

\(\displaystyle 300\)

\(\displaystyle 180\)

\(\displaystyle 280\)

\(\displaystyle 100\)

Correct answer:

\(\displaystyle 200\)

Explanation:

When we round a number to the hundreds place we look to our tens place to tell us if we round up or down. If the number in our tens place is \(\displaystyle 5\) or greater, we round up. If the number in the tens place is \(\displaystyle 4\) or less, we round down. When we round up, the number in the hundreds place increases by \(\displaystyle 1\) and all the other numbers become \(\displaystyle 0\). When we round down, the number in the hundreds place stays the same and all the other numbers become \(\displaystyle 0\).

In this case, \(\displaystyle 8\) is greater than \(\displaystyle 5\) so our rounded number is \(\displaystyle 200.\)

Example Question #4 : Round Numbers To The Nearest Ten Or Hundred: Ccss.Math.Content.3.Nbt.A.1

What is \(\displaystyle 255\) rounded to the nearest hundred? 

 

 

 

Possible Answers:

\(\displaystyle 100\)

\(\displaystyle 300\)

\(\displaystyle 200\)

\(\displaystyle 355\)

\(\displaystyle 155\)

Correct answer:

\(\displaystyle 300\)

Explanation:

When we round a number to the hundreds place we look to our tens place to tell us if we round up or down. If the number in our tens place is \(\displaystyle 5\) or greater, we round up. If the number in the tens place is \(\displaystyle 4\) or less, we round down. When we round up, the number in the hundreds place increases by \(\displaystyle 1\) and all the other numbers become \(\displaystyle 0\). When we round down, the number in the hundreds place stays the same and all the other numbers become \(\displaystyle 0\).

In this case, \(\displaystyle 5\) is equal to \(\displaystyle 5\) so our rounded number is \(\displaystyle 300.\)

Example Question #3 : Round Numbers To The Nearest Ten Or Hundred: Ccss.Math.Content.3.Nbt.A.1

What is \(\displaystyle 361\) rounded to the nearest hundred? 

 

 

 

Possible Answers:

\(\displaystyle 461\)

\(\displaystyle 361\)

\(\displaystyle 400\)

\(\displaystyle 300\)

\(\displaystyle 500\)

Correct answer:

\(\displaystyle 400\)

Explanation:

When we round a number to the hundreds place we look to our tens place to tell us if we round up or down. If the number in our tens place is \(\displaystyle 5\) or greater, we round up. If the number in the tens place is \(\displaystyle 4\) or less, we round down. When we round up, the number in the hundreds place increases by \(\displaystyle 1\) and all the other numbers become \(\displaystyle 0\). When we round down, the number in the hundreds place stays the same and all the other numbers become \(\displaystyle 0\).

In this case, \(\displaystyle 6\) is greater than \(\displaystyle 5\) so our rounded number is \(\displaystyle 400.\)

Example Question #4299 : Numbers And Operations

What is \(\displaystyle 489\) rounded to the nearest hundred? 

 

 

 

Possible Answers:

\(\displaystyle 300\)

\(\displaystyle 200\)

\(\displaystyle 100\)

\(\displaystyle 400\)

\(\displaystyle 500\)

Correct answer:

\(\displaystyle 500\)

Explanation:

When we round a number to the hundreds place we look to our tens place to tell us if we round up or down. If the number in our tens place is \(\displaystyle 5\) or greater, we round up. If the number in the tens place is \(\displaystyle 4\) or less, we round down. When we round up, the number in the hundreds place increases by \(\displaystyle 1\) and all the other numbers become \(\displaystyle 0\). When we round down, the number in the hundreds place stays the same and all the other numbers become \(\displaystyle 0\).

In this case, \(\displaystyle 8\) is greater than \(\displaystyle 5\) so our rounded number is \(\displaystyle 500.\)

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