1-Digit Multiplication: A Step-By-Step Review | Multiplying by a 1-Digit Number | Math with Mr. J

[Music] welcome to math with mr j [Music] in this video i'm going to go through a quick review of one digit multiplication if it's been a while and you need a quick refresher this should be helpful whether you're in high school college continuing your education as an adult helping with an assignment or maybe you just learned this recently and need a quick refresher really no matter where you're at here are a couple of examples to help you out let's jump into number one where we have 439 times seven now the first thing that we're going to do we're going to line this up vertically so we're going to rewrite it up and down so let's go below the problem here and we have 439 times seven now we can start multiplying and we start with the ones place so we have a 9 in the ones place we need to do 7 times 9 to start with 7 times 9 is 63 so let's write our 3 and then carry our 6 and then we work our way left so next would be the tens place so we have a three in the tens place seven times three is twenty-one and then we add that carried six so twenty-one plus six is twenty-seven let's put our seven and carry the two and then we have the hundreds place so a four is in the hundreds place seven times four is twenty-eight plus two is thirty so we can put our zero now there are no more places to the left so let's just bring our three down into the thousands place put our comma and our final answer is three thousand seventy three let's move on to number two and do another example for number two we have 2864 times five so let's rewrite this vertically 2864 times five start with the ones and then we will work our way left so we have a four in the ones place five times four is twenty let's put our zero carry the two then we have the tens place where we have a six five times six is thirty plus the carry two is thirty two carry our three then we have the hundreds where we have an eight so five times eight is forty plus three is forty three carry our four and then lastly we have the thousands where we have a two so five times two is ten plus that carried 4 is 14. so we'll put our 4 and then we do not have any more places to the left so we just bring our 1 straight down we have a comma here and our final answer is 14 hundred twenty so there you have it there's a quick review of one digit multiplication i hope that helped thanks so much for watching until next time peace you