Least Common Multiples (Mastery Check) | 5th Grade Math

[Music] welcome to fifth grade math with mr. J so here we are at the least common multiples mastery check where you are going to try some of these on your own to see if you have it down if you're looking for more of an instructional video I drop the link to the least common multiples instructional video down in the description so check that out and then come back to the mastery check to see if you have it down if you're ready for the mastery check and you haven't done a Master you check on my channel before you should have something to write with and something to write on out and when I say press pause here in a few seconds your press pause find the least common multiples to all these problems when you're ready and done press play and you'll check your answers with mine so if you're ready to start go ahead and press pause alright welcome back I'm assuming you have those five done so let's see how you do so at least common multiple four five and three your lists should look something like this depending on how many multiples you wrote out for each but for number one we run into a common multiple at 15 so your LCM is 15 number two we have 8 + 6 8 16 24 32 6 12 18 24 and we have one in common when we did the 24 so our LCM for number 2 is 24 number 3 we have 3 + 7 3 6 9 12 15 18 21 7 14 21 they will hit at 21 or match it anyone so our LCM is 21 if your lists look different than mine that's not a problem at all maybe you counted up to 35 and it looks like this that's fine as long as you have this part the same as me you're good to go at the lists differ a little bit that's not a big deal at all number 4 15 and 10 15 30 45 60 10 20 30 40 50 60 looks like we have one in common at 60 but this is why I always say double check we have one that is less than 60 we want the least common multiple so our better answer is 30 so we should have LCM equals 30 now 60 would be a common multiple but again we want least common multiple and then number 5 - 9 + 3 - 9 + 3 2 4 6 8 10 9 18 27 3 6 9 12 doesn't look like we have any matches there so we're gonna need to continue our lists 12 14 16 18 this one's at 27 my nines at 27 so I don't need to extend that list at all because I'm only at 18 up here and 12 down here so 12 15 18 I notice match here 18 18 and then let's look at my list for 9 there's an 18 so least common multiple equals 18 your goal for this would be four out of the five correct would show that you have it down or five out of the five correct so that was your goal for this mastery check hopefully you achieved it if you need a little more work you can check out the instructional video again and try the mastery check again but hopefully you hit that four or five mark thanks for watching