How To Add And Subtract Fractions Khan Academy

let's try to calculate10.1 minus 3.93. and i encourage youto pause this video and try it on yourown first, and then we can think about whetherwe did it the same way. so let's justrewrite it, aligning

How To Add And Subtract Fractions Khan Academy, the decimal and thedifferent place values. so 10.1 minus-- the 3is in the ones place, so i'll put it rightunder the 0-- 3.93. now, let's just tryto calculate this.

now, before we subtract, wewant all the numbers on top to be larger than thenumbers on the bottom. and we don't evenhave a number here. we could stick a 0 here. let me do that in adifferent color here. 10.1 is the same thing as 10.10,but we still face an issue here. 0 is less than 3. 1 is less than 9.

so we're going to do alittle bit of regrouping. so let's do that regrouping. so we could take a 10 away,one 10 away, and then one 10 is the same thing as 10 ones. so i could write a10 in the ones place. and i could takeone of those ones away so i'm goingto have nine ones, and give that oneto the tenths place. well, one is 10 tenths.

10 tenths plus 1 tenthis going to be 11 tenths. now, i could takeone of those tenths away and give it tothe hundredths place. 1 tenth is 10 hundredths. and now i have a higherdigit in the numerator, or at least as equalin the numerator as i have in the denominator. so 10 minus 3 is 7. 10 minus 9 is 1.

i have the decimal. 9 minus 3 is 6. and then i havenothing over here. so 10.1 minus 3.93, 6.17.