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Rounding (Nearest 10 and 100)
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What you will learn from this videoWhat you will learn
- How to round to the nearest 10 and the nearest hundred.
- Rounding can make numbers more understandable to work with.
- We'll discover that this knowledge can let us count how many balloons are at a party, how many animals live on a farm & even how many toys are in a toy store!
- Discussion Questions
Before Video
What is the value of each place in the number 634?ANSWERHundreds place: 600, tens place: 30, ones place: 4.
Students could draw a number line showing a tick mark for each number between 630 and 640 and label the tick mark for 634.
The hundreds place is the same in both numbers, so I need to compare the tens place. There are 0 tens in 207 and there are 5 tens in 250. 5 tens is greater than 0 tens, so 250 is greater than 207.
The digits in the hundreds place in each number are different, so I can compare the digits in the hundreds place. 9 is in the hundreds place in 948. 8 is in the hundreds place in 899. 9 is greater than 8, so 948 is greater than 899.
Jaffar is not correct. The way to compare numbers is to start with the greatest place first and compare the digits in that place. If the digits are the same, move on to the next digit to the right. In this case, the digit 2 is in the hundreds place in 200. There is no digit in the hundreds place in 99. This is the same as having 0 in the hundreds place. So we can compare the digits in the hundreds place. 2 is greater than 0, so 200 is greater than 99.
After Video
How can you draw and label a number line to help you round 378 to the nearest ten?ANSWERDraw a number line from 370 to 380. Put a tick mark in the middle and label it 375. 378 is greater than 375, so plot the point for 378 between 375 and 380. 378 is closer to 380 than 370, so 378 rounds up to 380.
Look to the right of the place you want to round to. If the digit in that place is 5 or greater, round up. If the digit in that place is less than 5, round down.
First I look at the tens place, which has the digit 4. The place to the right of that place is the ones place, and it has a 5. When I have a 5 in the place to the right, I round up, so 645 rounded to the nearest ten is 650.
849.
257.
- Vocabulary
- Rounding DEFINE
Makes numbers less exact but more convenient to work with.
- Nearest ten DEFINE
The multiple of ten that is closest to a given number.
- Nearest hundred DEFINE
The multiple of one hundred that is closest to a given number.
- Number line DEFINE
A straight line with numbers placed at equal intervals along its length.
- Halfway point DEFINE
A point that is halfway between two numbers on a number line.
- Ones place DEFINE
The place in a number that tells how many ones are in the number. In 247, there are 7 ones in the ones place.
- Tens place DEFINE
The place in a number that tells how many tens are in the number. In 247, there are 4 tens in the tens place.
- Hundreds place DEFINE
The place in a number that tells how many hundreds are in the number. In 247, there are 2 hundreds in the hundreds place.
- Round up DEFINE
Round to a number that is greater than the original number.
- Round down DEFINE
Round to a number that is less than the original number.
- Rounding DEFINE
- Reading Material
- Practice Word Problems
- Practice Number Problems
- Lesson Plan
- Teacher Guide
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Level 1
Round 75 to the nearest ten.
Level 2
Round 934 to the nearest hundred.
Level 3
Jason says 345 rounded to the nearest ten is 340. Is Jason correct? Explain.
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