Video: Reading Two-Way Frequency Tables Involving Subtraction

The table below shows the number of students that participate in school activities. Find the difference in the number of students participating in school radio activity in each school.

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Video Transcript

The table below shows the number of students that participate in school activities. Find the difference in the number of students participating in school radio activity in each school.

So if we take a look at our table, it’s the fifth column that we’re actually interested in, because this one is the school radio activity.

Well, we can see from the table that 67 students take part in school radio from the first school. And 80 students take part in school radio from the second school.

So, therefore, to find the difference what we’re gonna do is do 80 minus 67. And we can work out 80 minus 67 using a couple of methods.

The first method I’ll show you is the column method. So if we’ve got 80 minus 67, well zero minus seven we can’t do. So what we need to do is borrow from the tens column. So then, we change the eight to a seven. And then we’ve got one. So, it’s gonna give us 10 in our units column.

So then, we have 10 minus seven, which is three, and seven minus six, which is one, which gives us an answer of 13.

The other way we could’ve done this is by counting up. So if we think we had 67, then if we add three, we get to 70. And then add 10 and we get to 80. Well, 10 add three is 13.

So, therefore, we can say that the difference in number of students participating in school radio activity in each school is 13. And we got that because we subtracted 67 from 80.

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