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## PowerPoint Slideshow about 'Rounding Numbers' - najila

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Presentation Transcript

What is rounding and why do we need to round?

- Rounding numbers means finding the closest number that is easier to work with when you need to add or subtract multiple numbers.
- For example, when your parents go to the store, they can’t add $4.99, $3.89, and $8.99 in their heads. Instead, they round each amount to the nearest dollar. So,
- $4.99 becomes $5.00
- $3.89 becomes $4.00
- $8.99 becomes $9.00

These amounts are much easier to add in your head. they can expect the total to be around $18.00.

More Real Life Examples

- Sara gets paid $5.85 for each lawn she mows. If she mows 5 lawns, about how much money will she make? What amount is close to $5.75 that would be easier to work with?
- $5.85 can be rounded to $6.00. $6.00 x 5 = $30.00, so Sara will be making about $30.00.
- Blake is setting up a soccer tournament and needs to make sure he has enough water bottles for all the players. If Team A has 17 players, Team B has 22 players, and Team 18 players, about how many water bottles does he need to buy?

Rounding Steps

- Look at the number to the right of the underlined digit, then decide whether you’ll need to round “up” or “down”.
- If you have to round up, the underlined digit will increase by one.
- If you have to round down, the underlined digit will stay the same.

Practice

- Round the numbers below to the underlined place in your math notebooks:
- 789
- 5,345
- 3,497
- 756,494
- 1,324,578
- 2,548,367
- **Bonus** 9,999,999

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