If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content
Current time:0:00Total duration:1:53

Subtracting decimals: 10.1-3.93


Video transcript

let's try to calculate ten point one minus three point nine three and I encourage you to pause this video and try it on your own first and then we can think about whether we did it the same way so let's just rewrite it aligning the decimal and the different place values so ten point one minus the three is in the ones place I'll put it right under the zero three point nine three now let's just try to calculate this now before we subtract we want all the numbers on top to be larger than the numbers on the bottom and we don't even have a number here we could stick a zero here let me do that in a different color here we could stick a 0 here 3.0 10.1 is the same thing as ten point one zero but we still face an issue here zero is less than three one is less than nine zero is less than three so we're gonna have to do a little bit of regrouping so let's do that regrouping so we could take at an away one ten away and then one ten is the same thing as ten ones so I could write a 10 in the ones place and I could take one of those ones away so I'm gonna have nine ones and give that one to the tenths place well one is ten tenths ten tenths plus one tenth is going to be eleven tenths now I could take one of those tenths away and give it to the hundredths place one tenth is ten hundredths ten hundredths and now I have a higher digit in the numerator or at least as equal in 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 have nothing over here so 10 point one minus three point nine three six point six point one seven