Our lesson today began with the question about Emma's pedometer. We knew that she recorded how many steps she took in 2 hours. We also knew that she took 1347 steps in the first hour, and 984 steps in the second hour. We had to figure out how many more steps she took in the first hour than in the first.
We decided that we were looking for the difference, and we learned that the word difference means we need to be subtracting.
So we did: 1347-984.
We started in the ones column, subtracting 4 from 7 to get 3.
Then we subtracted the tens column. We knew we couldn't do 4-8, so we borrowed from the hundreds column to make the 4 into 14. Then we did 14-8=6.
Next, we subtracted the hundreds column. Because we had borrowed from the hundreds column for the tens column, we needed to do 2-9. We knew we couldn't do that, though, so we borrowed from the thousands column to make it 12-9, giving us 3.
We had nothing left in the thousands column.
Our answer was 363. Micah and Lisa wrote:
Emma took more steps in the first hour.
Emma took 363 more steps.
We also checked our answer with a calculator to make sure that it was correct.
So 1347-984=363.
Great job, ladies!
Questions? Post them here, or ask me tomorrow in class.
-Ms. Lewis.
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