Question Video: Using Part Whole Models to Make 100 | Nagwa Question Video: Using Part Whole Models to Make 100 | Nagwa

# Question Video: Using Part Whole Models to Make 100 Mathematics

Fill in the missing number.

02:01

### Video Transcript

Fill in the missing number.

The missing number in this problem is one of the parts in a part–whole model. The whole amount is worth 100. And this has been split into two parts: 80 and something else. So, we could say 100 is equal to 80 plus what. To help us find the answer, we could use 10 frames. Now, one 10 frame on its own only shows 10, but we can use it to make a fact that can help us. We know that 10 can be split into eight and two. Eight plus two equals 10.

Now, we know the number 100 is made up of 10 10s. So, to show the number 100, we’re going to need 10 10 frames. In our question, the number 100 has been split up into 80 and another number. How many 10s is 80? 10, 20, 30, 40, 50, 60, 70, 80. Eight groups of 10 make 80. But we don’t want eight groups of 10. We want to make 10 groups of 10. And this is where our number fact comes in useful. We know that eight and another two make 10. And so, 80 and another 20 make 100. 80 is a part, 20 is a part, and the whole is 100. The missing number from our part–whole diagram is 20.

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