Which of the following models
In this question, we’re shown four
different models made out of 10 frames. And we’re asked which of the models
represents this number here. It’s a one followed by a five. Do you remember how we say this
number? It’s the number 15, isn’t it? We know the number 15 is five more
than 10. We know we can use this fact to
help us spot where the number 15 is.
Now each of our models has got
something in common. Can you see it? They’re all made up of one full 10
frame and then some more counters. So each number is more than 10. Now remember, if we’re looking for
the number 15, we’re looking for a 10 frame and then five more, aren’t we? Can you spot which model this
is? It’s the bottom one, isn’t it? Let’s count down from 10 to
check. 10, 11, 12, 13, 14, 15.
Our first model shows four more
than 10. This is 14. The second model shows three more
than 10, which is the same as 13. Our third model shows two more than
10, which equals 12. But our last model shows five more
than 10. And so we know that this is the
model that represents the number 15.