Time!

http://www.visnos.com/demos/clock

What are some units of time that you know?

1 minute = __________ seconds 12 minutes = __________ seconds

What operation would you use to change a larger unit to a smaller unit?________What would you multiply 12 by to find the number of seconds in 12 minutes? __________How many seconds are in 12 minutes? _________

Line Plots Review from Third Grade

NUMBER OF ANIMALS PER HOUSEHOLD

What do you remember about line plots?A line plot displays data above a __________ ___________.Each mark above the number line represents ___________________________.Line plots make it (easy or hard?) to see if data falls into groups or clusters.

Calculating Elapsed Time

• Record what you know: Start time: _____________Elapsed time: _____________End time: _______________

SOMETIMES you can subtract!

How much time has elapsed from 1:20 to 3:45?

3:45 - 1:15

Sometimes you need to “borrow” 60 minutes, then subtract!

How much time has elapsed from 2:45pm to 4:20pm?

4:20 3:80 - 2:45 - 2:45

SOMETIMES when the time has elapsed from AM to PM, or PM to AM, you must solve in two parts.

How long are we in school from 9:00 am to 1:35pm?

From 9:00 am to 12:00 pm (noon): 3 hoursFrom 12:00 pm (noon) to 1:35 pm: + 1 hour 35 min

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