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Let’s see what you know about TIME… How many days are in one year? There are 365 days in one year. How many months are there in a year? There are 12 months in a year. How many days are there in one week? There are 7 days in one week.

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Great job so far- let’s try a few more questions! Approximately how many weeks are there in one month? There are approximately 4 weeks in each month. How many hours are in one day? There are 24 hours in one day. How many minutes are there in one hour? There are 60 minutes in one hour.

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Just a few more to see if you are a master of time… How many minutes are there in a 1/2 hour? There are 30 minutes in a 1/2 hour. How many seconds are there in one minute? There are 60 seconds in one minute. GREAT JOB! Now that I know you know these facts, let’s try some different types of questions.

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Use what you know to solve these time questions! How many minutes are in 2 hours? There are 120 minutes in 2 hours. Approximately how many weeks are there in 2 months? There are approximately 8 weeks in 2 months. What is another way I could say 90 minutes? An hour and a half is another way.

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Great job so far! Let’s try a few more… How many minutes are in ¼ of an hour? *Think, if I broke an hour up evenly into 4 pieces, what would one of those pieces be 15 minutes is ¼ or quarter of an hour. What time would it be if it was quarter of 12? It would be 11:45 because “of” means before the hour.

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Great! We sure know a lot about time! Now, let’s move onto elapsed time. What is elapsed time? Elapsed time is the difference between two times. This can be tricky. Let’s look at a good strategy for finding elapsed times.

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How to find elapsed times… Use a number line! When you see that both times are in a.m. or both times are in p.m., a number line can really help you. Let’s look at this example: Find the elapsed time from 2:30 p.m.- 7:40 p.m.

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Let’s try another one with a number line. Remember- each jump is one hour! Suzy started baking cookies at 4:45 p.m. She finished at 6:20 p.m. How long did it take her?

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What if I have to move from a.m. to p.m. or p.m. to a.m.? Let’s look at this problem: Joe went to bed at 8:30 p.m. He woke up at 7:15 a.m. How long did he sleep for? Let’s try another number line!

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Let’s try one more like that… Jimmy went to a movie at 10:45 a.m. It ended at 1:30 p.m. How long was the movie?

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Finally, what if the times aren’t over an hour apart? Let’s look at this problem: Sal sat down for dinner at 5:45p.m. He finished at 6:30. How many minutes passed? Let’s make a more specific number line for this one.

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Let’s try one more like that Betty went ice skating at 4:35p.m. She finished at 5:15. How many minutes passed?

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Remember, sometimes you will be working backwards as well! Bobby finished shopping at the mall at 3:30. He arrived there 1 hour and 30 minutes earlier. What time did Bobby arrive at the mall? Let’s try a number line!

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Let’s try one more… Lou left his job at the bank at 6:45. He arrived there 30 minutes earlier. What time did he arrive at the bank?

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Now it’s your turn! With a partner, you will find some centers around the room about elapsed time. Use your number line and Smart Pal to answer the questions! It’s a race against time~ you may begin!

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Grade 2 Elapsed Time Copyright © Ed2Net Learning, Inc.1.

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