Find the nearby hundred
Use hundreds and their halfway points to describe a number approximately.
Explore this lesson →12 practice questions · Optional read aloud · Thinking pad
Let’s understand the idea.
- Rounding to the nearest 100 means finding the nearest multiple of 100. Locate the original number between neighboring multiples.
- Compare the distances. The halfway point divides the interval into two equal distances; in a tie, choose the greater multiple.
- A number already on a multiple stays there. A rounded number is an approximate description: the original exact quantity has not changed.
Something to notice
These questions include below/above/at-midpoint cases, exact multiples, zero, rounding through the next hundred/thousand and explanations of why a choice is nearest. Ask learners to identify their own neighboring multiples and midpoint, then explain the relevant place value without the supplied line. Estimation in full word problems, inverse-rounding tasks and educator/learner review remain additional work. A practiced lesson is not mastery.
Try it. Change it. Explain it.
Open the lesson to use its pictures and controls. In How it works, connect the picture to the idea. In Play & discover, change the quantities and notice what stays the same. In Your turn, answer questions and use the explanation to check your reasoning.
You can ask for help, draw on the thinking pad, or listen to the question and answer options. Progress distinguishes independent work from work completed with help.
Let’s try it →Curriculum connection
Grade 3 · 3.NBT · US Common Core
This lesson is mapped to these standards. A completed activity is practice evidence, not a claim of mastery. Content is checked against the linked official standards and its mathematical models are tested.