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  • - [Instructor] What we're going to do in this video

  • is to start thinking about adding mixed numbers.

  • Now just as a reminder of what a mixed number is,

  • it'd be something like three and 2/8.

  • It's called mixed because part of the way

  • we represent this number is there's a whole number,

  • the three, and then part is as a fraction, 2/8.

  • But the numbers three and 2/8ths.

  • So let's think about how we might be able to add

  • three and 2/8ths to five and 3/8ths.

  • So pause this video and see if you can have a go at this

  • before we work through this together.

  • All right, now let's work through this together.

  • Now there's a couple of ways that we could approach this.

  • You might recognize that three and 2/8ths is the same thing

  • as three plus 2/8ths, and five and 3/8ths

  • is the same thing as five plus 3/8ths.

  • And so if we add these two things together

  • we're just adding really these four things together

  • and the order in which we add doesn't matter

  • so you could view this as three plus five

  • plus 2/8ths plus 2/8ths, plus 3/8ths,

  • notice it's just the same thing,

  • I'm just changing the order with which

  • we are adding, and now what is three plus five?

  • Three wholes plus five wholes,

  • we'll that's just going to be eight.

  • And then what is 2/8ths plus 3/8ths?

  • Well if I have two of something, in this case eighths,

  • and I add three more of that something,

  • in this case eighths, I'm gonna have five

  • of that something, in this case 5/8ths.

  • So this is going to be eight plus 5/8ths.

  • Which we can express as a mixed number

  • as just being equal to eight and 5/8ths.

  • Now there's other ways that you might see

  • folks approaching this.

  • You might see something like this

  • where people will write three plus 2/8ths

  • and then they will write right below that

  • they'll write the five in the ones place,

  • or in the whole number and there's only a ones place

  • in these whole numbers, so you'd write the five

  • right below the three and then plus

  • and then the fraction you'd write right below the fraction.

  • 3/8ths.

  • And then we can add vertically like this

  • where first we can look at the fractional part,

  • 2/8ths plus 3/8ths is going to be equal to 5/8ths

  • and then three plus five is going to be equal to eight

  • and if you add these two together,

  • eight and 5/8ths, you get eight and 5/8s.

  • So different ways to approach it,

  • but that will hopefully start to get you comfortable

  • with adding a mixed numbers.

- [Instructor] What we're going to do in this video

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A2 初級

有相同分母的混合數加法 (Adding mixed numbers with like denominators)

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    林宜悉 發佈於 2021 年 01 月 14 日
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