Video: Using Skip Counting to Find the Total in Equal Groups Models

There are 3 groups. I can skip count in 4s. There are 12 dots in total. How many are there in 5 groups of 4? How many are there in 7 groups of 3?

04:20

Video Transcript

There are three groups. I can skip count in fours. There are 12 dots in total. How many are there in five groups of four?

Now, that speech bubble at the top is here to help us. So before we start looking at the problem, let’s go back and think about what it’s trying to tell us. Firstly, there are three groups and these are represented in the diagram by the three squares. And inside each square, there’s an equal number of dots. And that’s why the number four is mentioned because each group contains four dots.

Now, if we were asked to find the total number of dots, when we first learn to count, we might start off by counting every single dot individually: one, two, three, four, five, six, seven, and so on. But as we get more confident with math, we can understand that it’s quicker to skip count. And in this case, we skip counting in fours.

And skip counting means instead of saying every single number, we jump in fours instead. When we first learn how to skip count, a good way to do this is to say all the numbers, but just to whisper all the numbers in between the fours. So let’s do that: one, two, three, four, five, six, seven, eight, nine, 10, 11, 12.

Did you notice the three numbers that we said, four, eight, 12? We can skip count in fours: four, eight, 12. There are three groups we can skip count in fours. There are 12 dots in total: four, eight, 12.

Let’s have a look at our problem. How many are there in five groups of four?

We can start off by thinking of our five groups. And they’re all equal groups because we’re told that we need five groups of four. How many are there altogether? Well, again, when we first learn to count, we could count each dot individually. But now we know a quicker way to find the answer.

Here’s our number line. This time instead of whispering, because we’re getting more confident, let’s just say the numbers as we skip count in fours: four, eight, 12, 16, and 20. How many are there in five groups of four? Four, eight, 12, 16, 20.

Let’s practice our skip counting skills with another problem.

How many are there in seven groups of three?

So we know what seven groups of three look like. There are seven groups and they’re equal groups because each one has three dots in it, seven groups of three. So shall we count every single dot? One, two, three. Now, we know a much quicker way; we can skip count.

Remember that in this question, we’ll not skip counting in four. We need to skip count in groups of three: three, six, nine, 12, 15, 18, and 21. And so we found a quick way of counting. And as we get more confident, we don’t even have to use a number line.

How many are there in seven groups of three? Three, six, nine, 12, 15, 18, 21.

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