ClassX Video Lessons Youtube Channel TutoringHour Rounding Numbers to the Nearest 10, 100, and 1000 | Round up and Round down
Welcome to a fun lesson on rounding numbers! Today, we’re going to learn how to make numbers easier to work with by rounding them to the nearest ten, hundred, or thousand. Rounding helps us do math faster and makes numbers simpler.
Imagine Debby is buying gadgets for $212 and $789. Adding these numbers can be tricky. But if we round them to $200 and $800, it’s easy to see that the total is $1,000! Rounding helps us quickly estimate totals.
Let’s try rounding the number 26 to the nearest ten. First, we look at the tens place, which is 2, and the ones place, which is 6. We know 26 is between 20 and 30. On a number line, 26 is closer to 30, so we round up to 30.
What if we had 22 instead? Since 22 is closer to 20, we round down to 20. It’s like imagining a ball rolling on a hill; it rolls towards the nearest number.
There’s a simple rule for rounding numbers. Let’s round 154 to the nearest ten. We look at the tens place (5) and the digit to its right (4). Since 4 is less than 5, we keep the tens place the same and change the ones place to zero. So, 154 rounds down to 150.
Now, let’s round 157. The tens place is 5, and the digit to its right is 7. Since 7 is 5 or more, we add 1 to the tens place, making it 6, and change the ones place to zero. So, 157 rounds up to 160.
Let’s round 895 to the nearest hundred. The hundreds place is 8, and the tens place is 9. Since 9 is 5 or more, we round up to 900.
Now, let’s round 4,507 to the nearest thousand. The thousands place is 4, and the hundreds place is 5. Since 5 is 5 or more, we round up to 5,000.
Now you know how to round numbers to make math easier! Try practicing with different numbers to get even better. Rounding is a handy skill you can use in school and everyday life.
If you want to learn more and practice, check out tutoringhour.com. Have fun rounding numbers!
Rounding Treasure Hunt: Go on a treasure hunt around your home or classroom! Find different objects that have numbers on them, like books with page numbers, clocks, or even food packages. Write down the numbers you find and practice rounding them to the nearest ten, hundred, or thousand. Share your findings with a friend or family member and see who can find the most numbers to round!
Number Line Hopscotch: Create a giant number line on the floor using tape or chalk. Mark numbers from 0 to 100. Take turns hopping to a number and then rounding it to the nearest ten. For example, if you land on 47, hop to 50 because 47 rounds up to 50. This activity helps you visualize how numbers round up or down and makes learning fun and active!
Rounding Story Time: Imagine you’re a shopkeeper who needs to quickly add prices for customers. Create a short story where you have to round numbers to give quick estimates. For example, if a toy costs $47 and a book costs $23, round them to $50 and $20 to quickly estimate the total. Share your story with the class and discuss how rounding helps in real-life situations.
Sure! Here’s a sanitized version of the YouTube transcript:
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Hello and welcome to Tutoring Hour! In this video, we’ll show you how to round off whole numbers to the nearest ten, hundred, and thousand using a simple trick. Rounding is simply adjusting digits to make calculations easier and quicker.
Let’s consider a scenario: Debby is buying electronic gadgets for $212 and $789. Adding these two amounts is taking her time. But what if the prices were $200 and $800? She could quickly tell that the total is $1,000, right? Rounding makes numbers simpler and easier to work with.
Now, let’s move on to the process of rounding using a number line and understand the underlying place value concept. We’ll try rounding the number 26 to its nearest ten. We look at the digit in the tens place, which is 2, and the ones place, which is 6. We know that 26 is more than 20 but less than 30. Therefore, 20 and 30 become our benchmarks.
Now, we need to decide if we will round down to 20 or round up to 30. On our number line, starting from 20 and going up to 30, we can see that 26 is between 20 and 30, but it is much closer to 30. If we imagine a log dropped at 26, it would roll towards 30, indicating that we need to round up.
But what if the log was dropped at 22? Since 22 is closer to 20, the log would roll back to 20, meaning we round down.
That was fun! But is there a way to round off without a number line? Yes! There’s a simple rule for rounding numbers. Let’s try rounding the number 154 to the nearest ten. First, we identify the digit we are rounding to, which is in the tens place (5). Next, we look at the digit to its right. If it’s 0, 1, 2, 3, or 4, we keep the targeted digit unchanged and drop the digit to the right to zero. So, 154 rounds down to 150.
But what if we see a 5, 6, 7, 8, or 9 to the right of the targeted digit, as in 157? Then we add 1 to the targeted digit, making it 6, and change the digit to the right to zero. This is rounding up, so 157 rounds up to 160.
Now, let’s round the number 895 to the nearest hundred. Our targeted digit in the hundreds place is 8. Looking at the digit to the right in the tens place, which is 9, it’s clear we round up to 900.
Next, let’s round 4,507 to the nearest ten. The targeted digit is 0, and the digit to its right is 7, so 4,507 rounds up to 4,510.
How about rounding the same number to the nearest hundred? Our targeted digit is 5, and the digit to its right is 0, so we round down, keeping the hundreds place as it is. Thus, 4,507 rounds down to 4,500.
Now, let’s round the same number to the closest thousand. The targeted digit in the thousands place is 4, and the digit to its right is 5, which means we round up to 5,000.
Looks like you’re all set to round off and simplify numbers in your head and use this technique efficiently in and outside the classroom! Now, it’s your turn. If you want to learn more and practice, then tutoringhour.com is the place to be.
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