Posted by IVAN on Monday, February 4, 2008 at 7:45pm.
FIND THE ELAPSED TIME
START 1:43
FINISH 6:20
HOW DO I FIND IT

math  Ms. Sue, Monday, February 4, 2008 at 7:59pm
6:30  1:43
You need to change 6:30 to 5:90 then subtract.
5:90  1:43 = ?
We'll be glad to check your answer.

math  IVAN, Monday, February 4, 2008 at 8:03pm
4 HR AND 47 MIN, WHAT I DON'T UNDERSTAND IS WHY DO I CHANGE 6:30 to 5:90, thank you Ms.Sue

math  Ms. Sue, Monday, February 4, 2008 at 8:37pm
You're welcome. Your answer is right. :)
The easiest way to subtract 1:43 from 6:30 is to change 6:30 to 5:90 because you can't take 43 from 30 without borrowing.
Thirty minutes after six is the same as 90 minutes after five.
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