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In these problems we are working with single unit
and multiple-unit conversions. So a single unit
is something like 30 months,
that would be single, and months and years would be in multiple
unit or multiple units. So let's write 30 months
in terms of months and years. So I'm going to write 30 months
as follows: 30 months
equals 12 months
plus 12 months,
that would be 24 months plus
6 months, that would be 30 months,
and I chose 12 months because 12 months
is 1 year. So I have two sets of 1 year,
plus 6 months. If I add those together now
I get 2 years 6 months, and now I have my multiple unit conversion.
If I look at the next example,
write 1 minute 20 seconds in seconds. I'm going from
two units to 1 unit. So let's write it this way,
1 minute 20 seconds equals
60 seconds plus
20 seconds. So there's my 1 minute
and 20 seconds, that would be 80 seconds,
therefore
my 1 minute 20 seconds as two units
equals 80 seconds as a single unit.