© 2023 WSKG

601 Gates Road
Vestal, NY 13850

217 N Aurora St
Ithaca, NY 14850

FCC Public Files:
Play Live Radio
Next Up:
0:00 0:00
Available On Air Stations
Good To Know is a digital video series for adults that introduces the methods, vocabulary, and processes their child learns at school. These short, clear and fun videos will help to explain math topics that are taught in Pre-Kindergarten, Kindergarten and Grade 1 Common Core curricula. The videos will help develop a conceptual understanding of how math practices build on previous knowledge and empower parents and caregivers to help their children learn foundational math skills!

Rounding: Nearest 10 or 100

Learning to assess the reasonableness of an answer is an important mathematical skill. It’s your child’s way of seeing if she’s on the right track when problem solving. Sometimes we use rounding to estimate a solution.In third grade, your child will round whole numbers using a vertical number line and round to the nearest ten or to the nearest hundred.Let’s round seven-hundred sixty-two to the nearest hundred. Your child knows seven-hundred sixty-two is made up of seven hundreds, six tens, and two ones. Seven hundreds is seven-hundred. So seven-hundred-sixty-two will fall somewhere above seven-hundred on the vertical number line.How many hundreds come after seven hundreds? Five-hundred, six-hundred, seven-hundred, eight-hundred… Eight hundreds!Next, your child will find the midpoint or halfway mark. What falls halfway between 700 and 800? This can be tricky, so your child may skip count by fifty. Six-hundred, six-hundred fifty, seven-hundred, seven-hundred fifty, eight-hundred… Seven-hundred fifty is the midpoint!Ask your child: Where will you place seven-hundred sixty-two on this number line? Ummm… Here! Just a little above the midpoint.Using a vertical number line is a very helpful model. Your child can clearly see that seven-hundred sixty-two is closer to eight-hundred than it is to seven-hundred, so it rounds up to eight-hundred.https://youtu.be/UZAwrUYMNcA?list=PLkEiFS5w2pdklsmmFUp86QbES0AI4rAvXSeven-hundred sixty-two rounded to the nearest hundred is eight-hundred. Or, seven-hundred sixty-two is approximately equal to eight-hundred.Talk with your child about this special case: When a number falls exactly on the midpoint, you round up. Like this - twenty-five is the midpoint, and twenty-five rounded to the nearest ten is thirty because you round up. Twenty-five is approximately thirty.Using a vertical number line gives your child a visual representation for rounding. With practice, she will always see when to round up and when to round down.And that’s good to know.

This video addresses Common Core Grade 3 Standard Number & Operations in Base Ten: Use place value understanding and properties of operations to perform multi-digit arithmetic.(3.NBT.1) Use place value understanding to round whole numbers to the nearest 10 or 100.