Rounding Off To The Nearest 10

Watch Rounding Off To The Nearest 10 - GenX-Education on Dailymotion

Transcript

00:00hi kids today we will be learning rounding off the numbers first of all

00:10what is rounding off rounding is to replace the number with another one that

00:21has value approximately equal to our original number but is simpler shorter

00:31and easier to represent and use in any calculation it makes number less exact

00:42but simpler to calculate rounding can be to the nearest 10 nearest 100 or nearest

00:561,000 so let's first learn rounding to the nearest 10 here are a few numbers

01:0912, 34, 27, 88, 45, 65 we have to round them up to the nearest 10 let's start with 12

01:28see the number line where can you fit 12 on this number line it is somewhere

01:39between 10 and 20 whenever you want to round a number there are always two

01:50options either we can round it down to previous 10 that is 10 here or we can

02:02round it up to the next 10 that is 20 here think which option do you think is

02:13more apt here is a rule to help you you always have a 5 mark midway between the

02:25two tens if the number is below 5 mark you round it down that is previous 10

02:36and if the number is at 5 mark or above the 5 mark you round it up that is to the next 10

02:50here 12 is below the 5 mark so we will round it down that is to 10 okay now let's take

03:06another number now we have to round off 34 to the nearest 10 where can you fit

03:1834 on this number line it is somewhere between 30 and 40 and we know whenever

03:31we have to round off a number we always have two options either we round it down or round

03:43it up also we learned that if the number is below 5 mark we round it down or else we round

03:54it up here 34 is below the 5 mark so we will round it down to 30 good now let's take another

04:10example where can you fit 27 on this number line it is somewhere between 20 and 30 and

04:23we know whenever we have to round a number we always have two options either we round

04:35it up or round it down also we learned that if the number is below 5 mark we round it down or

04:48else we round it up here 27 is above the 5 mark so we will round it up to 30 good

05:01now let's take another example now we have to round off 65 to the nearest 10 where can

05:17you fit 65 on this number line it is exactly between the two numbers 60 and 70 or it is on

05:33the 5 mark and we know if the number is on the 5 mark or above 5 mark we round it up so

05:46we will round it up to 70 so what have we learned we have learned whenever we have to round a number

05:58to the nearest 10 we round the number up if it's on the 5 mark or above the 5 mark and we round the

06:11number down if it's below the 5 mark good now you may go ahead and take a quiz to learn more bye-bye