Rounding numbers may seem simple, but it can be difficult for some students to know which number to round to. In this blog post, I will discuss how to boost student confidence in rounding numbers. I will provide tips and tricks for rounding numbers to the nearest ten and hundred. Following these tips and practicing regularly, students can confidently round numbers in any situation!
Table of Contents
Start With Place Value Understanding
One of the main reasons students struggle with rounding is because they do not have a strong understanding of place value. Place value is the value of a digit in a number based on its position. For example, in the number 123, the “ones” place has a place value of three (the number of objects), while the “tens” place has a place value of two (the number of tens). The “hundreds” place has a value of one (the number of hundreds). Students need to understand place value before they can learn how to round numbers correctly.
To help students understand place value, start by having them write out the numbers in expanded form. For example, the number 123 can be written as 100 + 20 + 3 = 123. This will help students see that each digit in a number has a value based on its position. You can also have students use place value charts to see the values of each digit in a number. Once students understand place value, they can round numbers correctly.
Rounding to the Nearest Ten Rules
There are two main rules for rounding numbers:
- If the number in the tens place is followed by 0 – 4, round the number down.
- If the number in the tens place is followed by anything else, then round the number up.
For example, if a student is asked to round the number 34 to the nearest ten, they would look at the digit in the ones place (the number four). If the number in the ones place is 0 – 4, then it rounds down to 30.
Rounding to the Nearest Hundred Rules
The rules for rounding to the nearest hundred are the same as those for rounding to the nearest ten.
- If the number in the hundreds place is followed by 0 – 4, round the number down.
- If the number in the hundreds place is followed by anything else, then round the number up.
For example, if a student is asked to round the number 234 to the nearest hundred, they would look at the digit in the tens place (the number three). Since the number three is followed by a number between 0 and 4, it would round down to 200.
Using Number Lines and Benchmark Numbers to Practice Rounding Numbers
One of the best ways for students to practice rounding is using number lines and benchmark numbers. A number line is a line that has numbers written at equal intervals. Benchmark numbers are specific numbers on a number line that students can use as reference points when rounding.
To use number lines and benchmark numbers to practice rounding, start by having students identify the benchmark numbers on a number line. For example, on a number line from 0 to 100, the benchmark numbers would be 0, 25, 50, 75, and 100. Once students have identified the benchmark numbers, they can practice rounding by finding which benchmark number a specific number is closest to.
For example, if a student is asked to round the number 42 to the nearest ten, they would look at the number line and see that 42 is closest to 40. Therefore, they would round the number down to 40.
Students can practice rounding by using number lines and benchmark numbers and become confident in their skills!
Rounding Practice Activities
Once students know the rounding rules, they need practice. I love these rounding worksheets that use number lines and both finding benchmark numbers and using benchmark numbers.
Number lines give students a visual representation of number placement, so they can understand why they are rounding up or down. The number is closer to the number it rounds to.
Students can boost their confidence and become experts at rounding numbers by using number lines, benchmark numbers, and these rounding worksheets!
These worksheets are especially effective when used with small math groups. Guiding your students through the steps for rounding using these number line representations helps them truly understand this concept.
If you want to know more about using them in small groups, this post can help!
Get these helpful practice worksheets by CLICKING HERE!
Rounding Numbers Anchor Chart FREEBIE
Your students will love this beautiful Rounding Anchor Chart that they can use to help them as they work towards rounding mastery! They can be used in student math notebooks, math centers, or guided math groups!
I hope these tips and resources help your students build confidence as they round numbers to the nearest ten and hundred. If you have any other great tips, please share them in the comments below!
Thanks for reading!
The most valuable resource that all teachers have is each other. Without collaboration our growth is limited to our own perspectives.Robert John Meehan
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