Video Transcript
Find the missing equation. Four subtract one equals three. What? Four subtract three equals one. And we have five possible
answers. Four subtract three equals two. Four subtract two equals one. Four subtract three equals one. Four subtract two equals two. Or four subtract one equals
three.
In this question, we’re given some
ten frames. And next to each of the ten frames
is an equation or a number sentence. Well, next, in nearly all of the
ten frames, the middle ten frame has a missing equation. And we’re asked to find the missing
equation or number sentence. So let’s have a look at our ten
frames. What do they show us?
In the first ten frame, we can see
four green counters. So we’re starting with four. But one of the counters has been
crossed out. We’ve taken it away. What are we left with if we have
four and we take away one? We’re left with one, two,
three. And we know this is true, don’t
we? Because one and three are a pair
that go together to make four. Four take away one equals
three.
If we look at our last ten frame,
we can see that we’ve started with four green counters again. But this time, we’ve taken away
three of them. How many are left? Or, in other words, what number
goes together with three to make four? We know that three and one make
four. And that’s why we can say four take
away three leaves us with one. So what’s our missing equation?
Again, we’ve started with four
green counters. But the diagram shows that we need
to take away two. The subtraction we’re looking for
is four take away two. Now, if we look at our possible
answers, we can see this is written twice. Four take away two equals one, and
the four take away two equals two. Which is correct? What number goes with two to make
four?
We know that two and another two
make four. And so if we take away two from
four, we’re going to be left with two. Our missing equation is four take
away two equals two.
