Rounding NumbersRounding Numbers

If the digit is five or If the digit is five or more, round up.more, round up.

For example: 36 would become 40.

If the digit is less If the digit is less than 5, you round than 5, you round

down.down.

For example: 23 would become 20.

5 or above, give it a 5 or above, give it a shove. 4 or below, let shove. 4 or below, let

it go!it go!

56 becomes 60

98 becomes 100

14 becomes 10

Rounding Rules1. Underline the place value you are rounding to.

(round 234 to the nearest ten) 2342. Circle the digit to the right of the underlined number.

2343A. If the circled digit is a 0, 1, 2, 3, or 4, the underlined number stays the

same.3B. If the circled digit is a 5, 6, 7, 8, or 9, add 1 to the underlined number.

4. All of the digits to the right of the underlined number, change to zeros.30

5. If there are any digits to the left of the underlined number, replace them.230

234 rounded to the nearest ten is 230

(There will be exceptions to the rule!)

4

Let’s See An Example

345Round to the hundreds place

1. Find and underline the place value.

345

Draw an arrow to the number behind the underlined number

345

Circle the number you drew the arrow to

3 4 5

This number is less than 4 so we just ignore and leave it as a 3!

3 4 5

Any number before the underlined number stays the same

345 We underlined the 3, so there are

no numbers before our underlined number.

All numbers after the underlined number become 0

345 So this means when we added 0 to

the 3 our answer was 3. Our answer should look like this

300

Round this number to the Round this number to the nearestnearest

thousand.thousand.

Find your number.

3 5, 4 5 2Circle the number in the thousands

place.

Round this number to the Round this number to the nearestnearest

thousand.thousand.

Look right next door.

3 5, 4 5 2Draw an arrow to the right of the

number.

Round this number to the Round this number to the nearestnearest

thousand.thousand.

4 or less, just ignore.

3 5, 4 5 2

Since 3 is less than 4 we do not changethe 5.

Round this number to the Round this number to the nearestnearest

thousand.thousand.

4 or less, just ignore.

3 5, 0 0 0

Change the numbers to left of 5 to 0’s.

Your Answer!Your Answer!

35,327 rounded to the nearest thousand is

3 5, 0 0 0

1) The radio cost about $70.

2) The radio cost $68.47.

One of the statements uses an exact number. The other statement uses a rounded number. Which statement uses the rounded number?Statement 1) is the rounded number. Rounded numbers

usually end with a zero.

Think about the number line when you rounded numbers.

1 2 3 4 5 6 7 8 9 10

The cafeteria is selling ice cream cones for 23¢ and ice cream sandwiches for 48¢. If Ms. Rodriguez buys an ice cream cone and an ice cream sandwich, about how

much money will she spend?

$1.00

70 ¢

50 ¢

25 ¢

Let’s try Let’s try a few.a few.

Round to Round to the nearest the nearest

tens.tens.

138138

140140

Answer

955955

960960

Answer

Round to Round to the nearest the nearest hundreds.hundreds.

236236

2o02o0

Answer

181181

200200

Answer

Thank you for purchasing this

product! If you like what you see,

consider leaving feedback. Visit

my Website to see more of my

products!

www.powerpointmaniac.com

Are you on Facebook? If so, join

Power Point Maniac’s Teaching

Resources to get ideas, resources,

and free stuff!

www.facebook.com/powerpointma

niac