yego.me
💡 Stop wasting time. Read Youtube instead of watch. Download Chrome Extension

Multiplying fractions by whole numbers word problem | Math | 4th grade | Khan Academy


2m read
·Nov 11, 2024

Rishi spent 34s of an hour for 2 days working on his science project. Kyle spent 1/4 of an hour for six days working on his science project. Who spent more time on his science project?

So we want to know who spent more time. To do that, we need to first know the amount of time Rishi and Kyle each spent on their science projects. So let's start with Rishi and see what we know about him.

Rishi spent 34s of an hour for two days. So, two times he spent 34s of an hour. Another way we could say this is he spent 34s of an hour once. Plus, on a second day, he spent another 34s of an hour. So, 34s plus another 34s will give us a total of 64s, or 64 hours, that Rishi spent on his science project.

Now, let's look at Kyle. Kyle spent a fourth of an hour. So, here's Kyle: he spent a fourth of an hour, but he did this for six days. So, six times, he spent a fourth of an hour. We could say that Kyle spent a fourth of an hour one day, plus a fourth of an hour a second day, a fourth of an hour a third day, a fourth day, a fifth day, and then a sixth day. He spent a fourth of an hour, so six times 1, 2, 3, 4, 5, 6. He spent a quarter, or a fourth of an hour, working on his project.

So, if we have 6 1/4s, then we have a total of 64ths. So, Kyle spent 64s, or 64 hours.

Now back to our question, now that we know how much each of them spent. Who spent more time working on his science project: Rishi with 6/4 hours or Kyle with 64 hours? The answer here, of course, is that these are equal. These are the same. Rishi and Kyle spent the same amount of time working on each of their science projects.

More Articles

View All
Thousands Of Miles Dead Reckoning | StarTalk
We’re featuring my interview with traditional Polynesian ocean Voyager 9 OA Thompson, and I had to ask him how the ancient Polynesians navigated 2400 miles from Hawaii to Tahiti without being able to calculate longitude. Let’s check it out. Okay, imagine…
How To Get Out Of A Funk | 5 Ways to Escape a Depressive Rut
Depression is a serious mental illness, and I am NOT a doctor, so if you are clinically depressed, get some professional help. But you don’t need to have clinical depression to feel like crap once in a while. In my life, I feel like I’ve lost my mojo, lik…
The Call of the Land: Meet The Next Generation of Farmers | Short Film Showcase
Well, there’s no other real choice, is there, but to fix what we have? It’s kind of like you don’t have that much control over what you’re passionate about. We’re not really used to hard work, a lot of people. We didn’t grow up on farms; we didn’t grow wi…
Worked example: Differentiating related functions | AP Calculus AB | Khan Academy
The differentiable functions X and Y are related by the following equation: the sine of X plus cosine of Y is equal to square root of 2. They also tell us that the derivative of X with respect to T is equal to 5. They also ask us to find the derivative of…
Watching a Rocket Launch at SpaceX with Elon Musk!
That I’ve never seen something like that, and the noise of it when it was going up was insane. I asked Grandpa, “What do you go in it?” and he goes, “What up, guys? Welcome back to the channel! Today, we are on Trump Force One, going to see the Starship r…
8 Daily Habits That Changed My Life
What’s up, you guys? It’s Graham here. So, the new year is fast approaching. It’s almost going to be 2020, and for some reason, I still think that five years ago was 2010. But anyway, as we get closer to the new year, people begin creating their New Year…