Round Whole Numbers to the Nearest 100

Students extend rounding to the nearest hundred, using a number line to identify the two nearest hundreds and determining which is closer. They apply place value understanding to look at the tens digit to decide which way to round.

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Grade 3 · Rounding Whole Numbers · question 1 of 3

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12 rungs. A star at the top.

111 ≈ (nearest hundred)

How it is taught

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Rounding to a hundred means the closest hundred.

The tens place tells which hundred is nearer.

Read it: Rounding to tens or hundreds

66 sits between 60 and 70. It is past the halfway point, 65, so it rounds to 70. Rounding to the nearest hundred works the same way, with hundreds.

Find the two tens, or the two hundreds, the number sits between.
Find the halfway point between them.
Past halfway rounds up. Halfway rounds up too. Before halfway rounds down.

Counting by ones from 60 up to 66 works, but it is slow and you can lose your place.

One jump of 4 from 66 lands on 70, so you skip the leftover ones.

65 is halfway. Past it, the nearer ten is 70, not 60.

If you sit on the middle or past it, round up to the higher ten or hundred.

Seeing 66 start with 6 and rounding down to 60.

Look at the ones. 6 is past 5, so 66 jumps to 70, not back to 60.

Round 117 to the nearest 100. — 100. 117 sits between 100 and 200, and halfway is 150. It is nearer 100.

Round 273 to the nearest 100

Lincoln School has two hundred seventy-three students. About how many is that — to the nearest hundred?

Two hundred seventy-three sits between two nearby hundreds: two hundred and three hundred.

The halfway point between them is two hundred fifty.

Let's plot two hundred seventy-three on the line.

It lands past the halfway mark — so it's closer to three hundred.

We can also use place value. Here is the number two hundred seventy-three.

Look at the tens digit. That's the seven.

Our rule: if the tens digit is five or more, we round UP.

Seven is five or more, so two hundred seventy-three rounds UP to three hundred.

Grade 3 · Use a number line and the tens digit to round

Two hundred seventy-three rounded to the nearest hundred is three hundred. Nice work!

What you see

While they climb, your page writes one true line to ask about tonight, and a short note each Sunday.

MayaGrade 3 · Mathematics

Did you know?

A chessboard has 64 squares — share them out between the 8 rows and each row holds exactly 8.

Today’s goal: 1 star — one skill mastered, every rung of its ladder climbed
Climbing now: Divide within 100

An example student.

MayaGrade 3 · Mathematics

Maya earned 2 stars this week — Interpret multiplication as equal groups, which took 6 answers over 3 days before its star landed 3 days ago and Multiply by 6, 7, 8 and 9. Next up: Divide within 100.

An example week.

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