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

Solving two-step word problems involving adding and subtracting decimals | Khan Academy


2m read
·Nov 10, 2024

We are told it takes Ally a total of 51.84 KM to get to work. She travels 6.07 km by car, 1.3 km by walking, and the rest by train. How many kilometers is Ally's train ride? Pause the video, have a go at it before we do it together.

Okay, so if we were to add the train ride plus the walk plus the car, it should total up to 51.84 km. Now we know what the walk is and what the car ride is; we just need to figure out the train ride.

Another way to think about it is the train ride should be equal to the total 51.84 minus the amount that we walk minus the amount that we drive by car. The amount that we walk is 1.3 km, and the amount that we go by car is 6.07 kilometers. So we just need to figure out what this is.

Let's do that. First, let's subtract the 1.3 and then let's subtract the 6.07. If I first try to calculate this part right over here, I have 51.84 minus—make sure to line up the place value—1.3.

All right, 400 minus nothing, minus 0 hundreds is 4 hundreds. 8 hundreds—make sure I pronounce it right—8/10 minus 3/10 is 5/10, and then 1 minus 1 is 0, and then 5 minus 0 is 5. So this right over here is 50.54 km now.

Let's subtract 6.07 from that, and I could actually just do that right over here. So let's say minus 6.07. All right, so we go to the hundred place; we can't subtract 7 from 4—a little bit of regrouping. Let's take a tenth, so now we only have four tenths here.

A tenth is the equivalent of 10 hundredths, so now we have 14 hundredths. We could subtract 14 minus 7 is 7, 4 minus 0 is 4. We have our decimal here, and we could do grouping again.

Or you might just recognize that 50 minus 6 is going to be 44. If we wanted to regroup, we could say, “Hey, let's take a 10 here,” and then that's 10 ones. 10 minus 6 is 4, and then you bring down those four tenths.

But either way, the amount that Ally travels by train is 44.47 km.

More Articles

View All
Pompeii: New Studies Reveal Secrets From a Dead City | National Geographic
A there was in that moment, 79 AD was really, I can say, the place to be, but was really an important, important our little but important town. Inside the cast are the skeletons of these people. So these are just a human being of debt population living 2,…
5 Tricks That Save A LOT of Money FAST
What’s up, guys? It’s Graham here, so let’s get right into it because we’ve got an issue here. According to research, nearly 60% of adults do not have enough money saved to cover a $1,000 emergency, and nearly a third of those people would have to resort …
AI for improved math scores
Hi everyone! Nice to meet you. My name is Danielle Sullivan, and I’m so excited to be the facilitator of this excellent math conversation today with my amazing colleagues. Today, we want to talk about math instruction, how it’s changed and shifted since t…
7 STOIC SIGNS OF RELATIONSHIP INCOMPATIBILITY | STOICISM INSIGHTS
Welcome back to Stoicism Insights. Today we’re diving deep into the intricacies of relationships through the lens of Stoic philosophy. Have you ever wondered what signs might indicate a fundamental misalignment in your relationships? Stick around, because…
The Logan Paul Cryptocurrency Scam Just Got Worse...
What’s up, Graham? It’s guys here. So, I certainly did not expect to make this video today. But when I see so many people calling out this new Logan Paul cryptocurrency scam, I felt the need to throw my hat into the ring, see what this is all about, and g…
There's no such thing as Universally Preferable Behaviour
Universally preferable behavior is the name of Stefan Malan’s book arguing for an objective non-religious foundation for morality. Uh, I’ll begin by saying I don’t believe that anything that could fairly be called objective morality exists. Uh, so catego…