Adding Three Decimals | Math with Mr. J

[Music] welcome to math with mr j [Music] in this video i'm going to cover how to add three decimals now if you're able to add two decimals you're going to be able to add three it's the same exact setup and process is adding two decimals except we're going to be working with three let's jump into our examples and start with number one where we have five and four tenths plus three and twenty seven hundredths plus hundredths so the first thing we need to do when we set this up is line our decimals up so five and four-tenths then we have three and twenty seven hundredths and then ninety nine hundredths so our decimals are lined up now the problem does look a little offset because five and four tenths doesn't go to the hundredths place like the other decimals so we can use placeholder zeros so this problem looks a little more lined up remember zeros to the right of a decimal do not change the value they give us an equivalent decimal so we can do this so let's put a zero in the hundredths place now everything goes to the hundredths and we're a little more lined up once we have that we add so we start by adding the hundredths place so zero plus seven plus nine that's going to give us sixteen so regroup or carry the one then we add the tenths so one plus 4 is 5 plus 2 is 7 plus 9 is 16. regroup or carry the 1. now i'm going to bring my decimal straight down into my answer that decimal should be lined up throughout the entire problem now we add the ones so 1 plus 5 is 6 plus 3 is 9. our final answer 9 and 66 hundredths now i do want to mention one more time where to place the decimal in the answer so bring the decimal straight down decimal should be lined up throughout the entire problem when we add decimals even in the answer so again bring that decimal straight down let's move on to number 2 where we have 61 and 3 10 plus 38 plus seven and seven hundred forty-two thousandths let's line this problem up so sixty-one and three-tenths plus thirty-eight now thirty-eight is a whole number but it still has a decimal whenever you're working with a whole number and you need to line up decimals decimals come after whole numbers so the decimal comes after the 38. then we have 7 and 742 thousandths so let's use some placeholder zeros to get this problem lined up a little better so everything needs to go to the thousandths place and now we're lined up and ready to add so start with the thousandths we have zero plus zero plus two that's going to give us two now for the hundredths zero plus zero plus four that gives us four now the tenths three plus zero plus seven that gives us ten so we put our zero and regroup or carry the one bring our decimal straight down and now we add the ones so one plus one is 2 plus 8 is 10 plus 7 is 17. regroup or carry the 1 and we end with the tens place where we have 1 plus 6 plus 3 so 1 plus 6 is 7 plus 3 is 10. so we put our 0 and then regroup or carry the 1 over to the hundreds there's nothing else in the hundreds so we can just bring it straight down and our final answer one hundred seven and forty two thousandths so there you have it there's how you add three decimals i hope that helped thanks so much for watching until next time peace