Rounding and Estimating Numbers

18.9

Rounded to nearest ten

Here we will tell you what 140 is rounded to the nearest ten and also show you what rules we used to get to the answer.

Remember, we did not necessarily round up or down, but to the ten that is nearest to 140.

First, 140 rounded to the nearest ten is:

140

When rounding to the nearest ten, like we did with 140 above, we use the following rules:

A) We round the number up to the nearest ten if the last digit in the number is 5, 6, 7, 8, or 9.

B) We round the number down to the nearest ten if the last digit in the number is 1, 2, 3, or 4.

C) If the last digit is 0, then we do not have to do any rounding, because it is already to the ten.

10001/999900

To round 1004.8 to the nearest tenth, we look at the digit in the hundredths place, which is 8. Since 8 is greater than or equal to 5, we round the digit in the tenths place up by 1. Therefore, 1004.8 rounded to the nearest tenth is 1004.9.

To convert 4kg 400g to the nearest kilogram, we need to consider the grams. Since 400g is more than half of a kilogram (500g), we round up to the nearest kilogram. Therefore, 4kg 400g rounded to the nearest kilogram is 5kg.

To round 3.3125 to the nearest tenth, we look at the digit in the hundredths place, which is 1. Since 1 is less than 5, we do not round up. Therefore, 3.3125 rounded to the nearest tenth is 3.3.

Ah, rounding numbers can be a peaceful experience. When we look at 466, we see that the digit in the tens place is 6. Since 6 is closer to 10 than to 0, we round 466 to 470. Just a little adjustment to bring harmony to our numbers.

700

It is 57,000 when rounded to the nearest thousand

4.0

Oh, dude, rounding to the nearest tenth means we're looking at the first decimal place. So, for 5.8, the number after the decimal point is 8, which is greater than 5, so we round up. Therefore, 5.8 rounded to the nearest tenth is 5.8. Voilà!

Well, let's take a moment to appreciate the number 2.009. When we round it to 2 significant figures, it becomes 2.0. Remember, rounding can help simplify numbers and make them easier to work with. Just like adding a happy little tree to a painting, rounding can add clarity to our calculations.

800

14000

3.7

When rounding a number to the nearest whole number, you look at the digit to the right of the decimal point. In this case, that digit is 6. Since 6 is equal to or greater than 5, you round the whole number up. Therefore, 25.6 rounded to the nearest whole number is 26.

To round 1574 to the nearest thousand, we look at the hundreds place, which is 5. Since 5 is greater than or equal to 5, we round up to the next thousand, making it 2000. To round to the nearest hundred, we look at the tens place, which is 7. Since 7 is greater than or equal to 5, we round up to the next hundred, making it 1600. Finally, to round to the nearest ten, we look at the ones place, which is 4. Since 4 is less than 5, we keep the tens digit the same, resulting in 1570.

20

12000

400

When rounding a decimal number to a whole number, you look at the digit immediately to the right of the decimal point. If it is 5 or greater, you round up; if it is less than 5, you round down. In this case, 40.5 has a 5 in the tenths place, so it rounds up to 41 as a whole number.

4.75

850

807 rounded to the nearest tens is 810

900