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- [Instructor] We're told,

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the table gives the amounts[br]of materials Aya recycled.

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So we have the different materials here,

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and then it gives the various amounts.

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How many kilograms of paper[br]and aluminum did Aya recycle?

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So pause this video and see[br]if you can figure this out.

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Okay, so we're thinking[br]about paper and aluminum,

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so paper is right over here.

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She recycled 277 kilograms of paper.

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And aluminum is right over here.

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She recycled 134 kilograms of aluminum.

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And so we want the[br]combination, or the sum,

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of paper and aluminum, so it's going to be

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277 kilograms plus 134 kilograms.

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So we really need to figure[br]out what 277 plus 134 is,

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and in multiple videos, we have talked

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about how there's many different[br]ways of approaching this.

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We could say, well let's[br]just break up the 134.

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We could start at, actually let[br]me do this on a number line.

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That sometimes is a fun thing to do.

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So if we were to just say,[br]this is our number line,

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and we're going to start[br]at 277 right over there.

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So first, we could add[br]100, because we have 100

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right over there, so let's do that.

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If we add 100, so plus[br]100, where does it get us?

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Well if we add 100 here, we get to 377.

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So 300, I'll just write, 77.

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And then we could add three 10s, or 30.

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So then we're going to add 30.

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So let's add 30, so plus 30.

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What does that get us?

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So this is interesting.

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If you add 30 to 370,

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you would get to 400,

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and then we have another seven there,

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so that gets us to 407.

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So then we get to 407.

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And once again, this is just one way

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to try to think about it.

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And then, last but not[br]least, we could add the four.

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So then you say, we're there right now,

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and then we add plus four,[br]and seven plus four is 11,

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so 407 plus four is 411.

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So how many kilograms of paper[br]and aluminum did Aya recycle?

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Would be 411 kilograms.

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Kilo, kilograms, and we're done.