Rounding to the Nearest Hundred for Kids: Easy Number Line Trick (Grade 3 Math)

Hi, I'm Luna from DoodleBeez. Today we are rounding to the nearest hundred. Rounding gives us a friendly number that is close to the real one. It helps us estimate quickly.

Let's round three hundred sixty two. First, find the two hundreds it sits between. Three hundred sixty two is more than three hundred but less than four hundred.

Halfway between three hundred and four hundred is three hundred fifty. Three hundred sixty two is past the halfway mark, so it is closer to four hundred. Three hundred sixty two rounds to four hundred.

Here is a quick rule. Look at the tens digit. If it is five or more, round up. If it is four or less, round down. In two hundred thirty eight, the tens digit is three, so it rounds down to two hundred.

What about a number exactly halfway, like four hundred fifty? The tens digit is five, so we round up. Four hundred fifty rounds to five hundred.

Rounding helps with estimating. A school has two hundred eighty one students in the morning and three hundred twelve in the afternoon. Round them to three hundred and three hundred. That is about six hundred students.

Now it's your turn. Round six hundred seventy one and eight hundred fifteen. Pause and try. Six hundred seventy one has a seven in the tens place, so it rounds up to seven hundred. Eight hundred fifteen rounds down to eight hundred.

Great job! Remember, find the two hundreds a number sits between, then look at the tens digit. Five or more rounds up, four or less rounds down. Practice rounding in the Math Lab at doodlebeez.com. See you next time!