## Thursday, March 17, 2011

### [Mathematic Form 1] Convert 24-hour system into the 12-hour system

To convert the 24-hour system into the 12-hour system, follow the step below;
1. If the time is between 0000 hours and 0059 hours

You should...

• Add a dot between the hours and minutes

• Write am

Example:

• 0035 + 12.00 = 1235. So, 0035 = 12.35am

2. If the time is between 0100 hours and 1259 hours

You should...

• Remove the zero if necessary

• Add a dot between the hours and minutes

• Write am or pm

Example:

• 0530 = 5.30am

• 1235 = 12.35pm

3. If the time is between 1300 hours and 2400 hours

You should...

• Subtract 1200 from it

• Add a dot between the hours and minutes

• Write pm

Example:

• 1428 - 1200 = 228. So, 1428 = 2.28pm

• 2358 - 1200 = 1158. So, 2358 = 11.58pm

More Examples:
1. Convert each of the following into 24-hour system.

• 12.36am = 0036

• 3.45am = 0345

• 12.50pm = 1250

• 4.37pm = 1637

2. Convert each of the following into 12-hour system.

• 0048 = 12.48am

• 0539 = 5.39am

• 1255 = 12.55pm

• 1729 = 5.29pm