# Round to the Nearest Hundred

Videos, examples, solutions, and lessons to help Grade 3 students learn how to round to the nearest hundred on the vertical number line.

Common Core Standards: 3.NBT.1, 3.MD.1, 3.MD.2

New York State Common Core Math Module 2, Grade 3, Lesson 14
Grade 3, Module 2, Lesson 14 (pdf)

Application Problem

Model the following on the place value chart:
1 tens
1 hundreds
13 tens
13 hundreds
13 tens and 8 ones
13 hundreds 8 tens 7 ones

Concept Development

We’ve practiced rounding numbers to the nearest ten. Today let’s find 132 grams rounded to the nearest hundred.

How many hundreds are in 132 grams? 1 hundred

Draw a tick mark near the bottom of the number line.
To the right, label it 100 = 1 hundred.

What is 1 more hundred? 2 hundredsDraw a tick mark near the top of the number line. To the right, label 200 = 2 hundreds.

What number is halfway between 100 and 200? 150! In unit form, what is the number halfway between 1 hundred and 2 hundreds? 1 hundred 5 tens.

Estimate to draw a tick mark halfway between 100 and 200. Label it 150 = 1 hundred 5 tens.

Look at your vertical number line, is 132 more than halfway or less than halfway between 100 and 200?
132 is less than halfway between 1 hundred and 2 hundreds.

132 rounded to the nearest hundred is? 100.
In unit form. : 1 hundred 3 tens 2 ones rounded to the nearest hundred is 1 hundred.

Homework

1. Round to the nearest hundred. Use the number line to model your thinking.
d. 804 ≈ _________
f. 1260 ≈ __________
2. c. A bottle of juice holds 386 milliliters. Round the capacity to the nearest 100 milliliters.

Try the free Mathway calculator and problem solver below to practice various math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations. 