# math

FIND THE ELAPSED TIME
START 1:43
FINISH 6:20

HOW DO I FIND IT

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1. 6:30 - 1:43

You need to change 6:30 to 5:90 then subtract.

5:90 - 1:43 = ?

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Ms. Sue
2. 4 HR AND 47 MIN, WHAT I DON'T UNDERSTAND IS WHY DO I CHANGE 6:30 to 5:90, thank you Ms.Sue

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3. 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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Ms. Sue

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