Video Transcript
Find the missing part. 72 what two. Is it 70, seven, or 700?
We’re shown a part–whole model. The whole part is the number 72,
which is a two-digit number. It has a tens part and a ones
part. The missing part is the tens
part. So we need to work out how many 10s
there are in the number 72. We already know that 72 has two
ones. Is the missing part 70, seven, or
700?
We already know the two digit is
worth two ones. And we also know that the number 72
has a seven digit, which is its tens digit. We might think that the missing
number is seven, but it’s not. We have to think about what seven
10s are worth. Here are seven 10s. Let’s count in 10s to find out what
they’re worth. 10, 20, 30, 40, 50, 60, 70.
The missing part of the number is
70. 72 is made up of seven 10s, which
are worth 70, and two ones.
