How to Round Decimals | Math with Mr. J - Free Educational videos for Students in K-12

How to Round Decimals | Math with Mr. J - By Math with Mr. J

Transcript


00:0-1	Welcome to Math with mr J . In this video
00:05	, I'm going to cover how to round decimals Now
00:08	. Rounding is a very important skill because it's used
00:12	all throughout math and life . When we round we
00:15	find a close or approximate value to the number we're
00:18	working with . Rounding helps us make numbers easier and
00:22	simpler to work with and can even make them shorter
00:25	. You've probably come across a very long decimal answer
00:28	on a calculator or after working out a problem .
00:32	Rounding decimals is very useful in these situations along with
00:37	many others . And again , when we round we
00:40	find a close value to our original number . Let's
00:44	jump into our examples and see exactly how we round
00:48	decimals . So for number one we have six and
00:52	78/100 . The first thing that we need to do
00:55	find the place that we're rounding to . For number
00:58	one we're going to round to the 10th place .
01:01	Let's underline the digit in the 10th place . So
01:05	that's seven . Once we have that we look at
01:08	the place and digit to the right , so to
01:11	the right of the place place we have the 100th
01:15	place In the hundreds place . We have the Digit
01:18	eight . So let's draw an arrow to show that
01:21	we are looking to the right now . That digit
01:24	to the right is very important . It determines if
01:27	we round up or stay the same , essentially what
01:31	we're doing we're seeing is this closer to six and
01:35	7/10 or is it closer to six and 8/10 ?
01:39	So five or more ? We round up four or
01:43	less we stay the same . Well eight is more
01:46	than five . So we are going to round up
01:50	I'm going to draw something that looks like an equal
01:53	sign but it's with curved lines that means we're finding
01:57	an approximate or rounded value . So again we're rounding
02:02	up so we are rounding to six and 8/10 .
02:07	That's our final rounded answer . Now I cut that
02:11	decimal off after the 10th place . When we round
02:15	decimals we cut them off after the rounded place .
02:18	We don't need to change everything to the right to
02:21	a zero . Like we do with whole numbers zeros
02:24	to the right of the decimal . Do not change
02:27	the value of that decimal so we can leave them
02:30	off . So again we can cut that decimal off
02:35	After the rounded place . So six and 8/10 .
02:39	Our final rounded answer . Let's move on to number
02:42	two where we have 455 1000th . Let's round this
02:48	number to the 100th place . Underline the digits in
02:52	the hundreds place so that five let's look to the
02:56	right so we have a five in the place to
03:00	the right so five or more . We round up
03:03	four or less we keep the digit the same .
03:06	Well that's five or more . So we round up
03:10	So we round two 46/100 and we cut that off
03:17	after the rounded place . So after the 100th place
03:21	and our final rounded answer 46/100 . Now before starting
03:27	number three , I do want to mention that there
03:29	are sayings to help you remember the rounding rules for
03:33	example , five or more , raise the score four
03:38	or less , let it rest . Let's move on
03:41	to number three where we have 27 7392 10/1000 .
03:49	Let's round this one to the 1000th place . So
03:53	this nine right here , Look to the right ,
03:57	we have a two so five or more or four
04:00	or less . Well that's four or less . So
04:03	we keep that nine the same here and our final
04:08	rounded answer 27 and 739000s . Moving on to number
04:18	four , we're going to round number four to the
04:20	100th place . So the six , let's look to
04:24	the right , we have a three , five or
04:27	more or four or less . Well that's four or
04:30	less . So we stay the same And we round
04:33	two 26 100th . Let's move on to number five
04:41	where we have three and 8/10 . So we're going
04:45	to round this one to the ones place . This
04:48	is also known as rounding to the nearest whole number
04:52	. So we're seeing is this closer to three or
04:56	is it closer to four ? Let's look to the
04:59	right And we have an eight . So 8 is
05:03	five or more . So we round up three and
05:06	8/10 rounds to four . Now , if you were
05:11	to put four decimal zero , you change that 10th
05:15	place to a zero . This would still be correct
05:18	. These are equal . But like we talked about
05:21	earlier you can cut decimals off after the rounded place
05:25	because Zeros to the right of the decimal do not
05:28	change the value . Lastly let's move on to number
05:31	six where we have a very long decimal and we're
05:34	going to round this one to the 10th place .
05:37	So let's underline the digit in the 10th . This
05:41	too . Look to the right we have a nine
05:44	. So is that five or more or four or
05:47	less ? While nine is more than five . So
05:49	we round up so I will come below here so
05:54	I have enough room . This is going to round
05:56	up to one and 3/10 cut off after the 10th
06:02	place . Right after the rounded place Again . Final
06:05	rounded answer one and 3/10 . So there you have
06:09	it . There's how you round decimals . I hope
06:12	that helped . Thanks so much for watching until next
06:16	time . Peace . Mhm Yeah . Yeah .

Summarizer

DESCRIPTION:

OVERVIEW:

How to Round Decimals | Math with Mr. J is a free educational video by Math with Mr. J.

This page not only allows students and teachers view How to Round Decimals | Math with Mr. J videos but also find engaging Sample Questions, Apps, Pins, Worksheets, Books related to the following topics.