Estimation or calculation

1. You determine how much money you will spend on food, gas and rent in one month.
2. You add up the values from your grocery and restaurant receipts to determine the amount you spent on food during the past 5 days.
3. You find a source that provides you with the number of residents in Ellensburg in 2016 and use this to determine the number of current residents.
4. You find an article that states the average number of electronic devices used per person in the United States. You use this value to determine the number of devices owned in the city you live.
5. You find a source that gives a value in kilograms and convert it to pounds to match the value you found in another source.