Question Video: Converting Grams to Kilograms and Grams Using Models | Nagwa Question Video: Converting Grams to Kilograms and Grams Using Models | Nagwa

# Question Video: Converting Grams to Kilograms and Grams Using Models Mathematics • Fourth Year of Primary School

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Complete the model.

02:51

### Video Transcript

Complete the following model.

The model that’s being talked about in this question is the part–whole model that we can see underneath. And it’s labeled with some different measurements of mass. Let’s have a look at what we’ve got. The whole amount at the top here is 2,435 grams. And the two parts that it’s been split or partitioned into are interesting. Firstly, we’ve got two kilograms. This is interesting because it’s a completely different unit of measurement, isn’t it? We’ve started off with an amount of grams, and we’ve split it into a number of kilograms and some more grams. And this part is interesting too because this is the missing number we’re looking for.

Now can you see what makes this part–whole model tricky? It’s the fact that one of our parts is in kilograms. If all the parts were in the same unit of measurement, it’d be fine. We could find out the missing number quite quickly. So perhaps the first thing we should do to help ourselves is to convert these two kilograms into grams. And we can use a fact about kilograms and grams to help us.

There are 1,000 grams in a kilogram. And so one way to find the number of grams that there are in two kilograms is to take the number of kilograms that there are, which is two, and to multiply it by the number of grams there are in one kilogram, in other words, find out the answer to two multiplied by 1,000. Now there are different ways we could use to help us multiply by 1,000. But because we’re only multiplying it by two, it’s quite quick to do in our heads, isn’t it? Two lots of 1,000 are worth 2,000.

So now to make this part–whole model a little easier to understand, we could cross through our two kilograms. And we could write it in a different way. We’ve converted our two kilograms into grams. Two kilograms are worth 2,000 grams. And now we should be able to work out what our missing answer is. The whole amount is 2,435 grams. One of our parts is worth 2,000 grams. So that’s all our thousands used up. And we’re just left with our hundreds, tens, and ones. Our part–whole model started off by having mixed units of measurement. So the first thing we did was to convert kilograms into grams. And this helped us see more easily that 2,435 grams can be split into 2,000 grams and 435 grams. Our missing number is 435.

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