Here are useful units of measure to know

Time
1 minute (min)	= 60 seconds (s)	1 year (yr)	= 365 days (day)
1 hour (hr)	= 60 minutes (min)	1 year (yr)	= 12 months (mo)
1 day	= 24 hours (hr)	1 year (yr)	= 52 weeks (wk)
1 week (wk)	= 7 days

Example 1:

Do the following conversions. Round to nearest tenth where necessary.
4 day = hr

We know that there are 24 hours in 1 day so

4 day × = × =  96 hr

So, 4 day = hr

Example 2:

Do the following conversions. Round to nearest tenth where necessary.
36 mo = yr

We know that there are 12 months in a year so

36 mo × = × =  3 yr

So, 36 mo = yr

Example 3:

Do the following conversions. Round to nearest tenth where necessary.
1800 s = hr

To convert seconds to hours, there are multiple steps:   seconds --> minutes --> hours

Step 1:  Convert seconds (s) to minutes (min) by multiplying 1 min / 60 s

1800 s ×

Step 2:  Convert minutes (min) to hours (hr) by multiplying 1 hr / 60 min

1800 s × ×

Step 3:  Solve the equation

1800 s × × =

301800 s × × =

= 0.5 hr So, 1800 s = hr Copyright Accurate Learning Systems Corporation 2008. MathScore is a registered trademark.