Video Transcript
Daniel started with 16. He took away six to make 10, then
took away two more. Pick a calculation that is the same
as what Daniel did. 16 take away six, 16 take away
eight, or 16 take away four.
In this problem, we can see that
Daniel is subtracting from a teen number. We know this for a number of
reasons. We’re told that he starts with the
number 16. We can see in the picture that
there are 16 counters before some get crossed off. And all of our possible answers
start with the number 16 too. So, we know that Daniel is trying
to find the answer to 16 take away something. But what number is he trying to
take away?
Well, if we read the question
carefully and look at the pictures, we can see that Daniel finds the answer in two
steps. First, we’re told he took away
six. Now, why might Daniel split up his
subtraction into two steps and only take away six to start with? Well, we’re told this again in the
question. He took away six to make 10. We know this is a quick calculation
to work out. 16 take away six leaves us with
10.
And you know by making 10 like
this, what Daniel’s done is he’s made the calculation a lot easier cause now all he
has to do is take away whatever’s left from 10. And we can subtract from 10 really
quickly. We’re told that Daniel took away
two more. And if we look in the bottom
picture, we can see the two extra counters that Daniel’s taken away. It’s a quick way of finding the
answer because Daniel probably knows that two and eight go together to make 10. So, if he subtracts two from 10,
he’s going to be left with eight.
By reading the problem carefully
and looking at the pictures, we can see exactly what Daniel is doing. First, he took away six, and then
he took away two more. Daniel found the answer to 16 take
away six take away two. And the calculation that’s the same
as this is 16 take away eight.
