Math FlashMath FlashRoundingRounding

Use roundingUse rounding

• When the question asks you

to estimate.• When the question asks

“about how many”…?• When an exact answer isn’t

possible.• When an answer is difficult to obtain.

Memorize this PoemMemorize this Poem

Find your number.Look right next door.4 or less just ignore.5 or more, add 1

more.

Use Place Value Carefully to Use Place Value Carefully to Round!Round!

1. Find the digit in the place you are asked to round to. (tens,

hundreds or thousands)2. Look right next door. Look at the

number in the place to the right! 3. If the number in the place to the

right is 4 or less “just ignore” and keep

the digit the same.4. If the number in the place to the

right is 5 or more, you add 1 more to

the digit.

Round this number to the Round this number to the nearestnearest

ten.ten.

Find your number.

657Circle the number in the tens

place.

Round this number to the Round this number to the nearestnearest

ten.ten.

Look right next door.

6 5 7Draw an arrow to the right of thenumber. Look at the ones place.

Round this number to the Round this number to the nearestnearest

ten.ten.

5 or more, add one more.

6 5 7 Since 7 is more than 5 we “round up”

and add one to the tens place.

Round this number to the Round this number to the nearestnearest

ten.ten.

5 or more, add one more.

6 6 0

Change the numbers in the ones place to 0’s.

The AnswerThe Answer

657 rounded to the nearest ten is

660

Round this number to the Round this number to the nearestnearest

ten.ten.

Find your number.

8 4 4Circle the number in the tens

place.

Round this number to the Round this number to the nearestnearest

ten.ten.

Look right next door.

8 4 4Draw an arrow to the right of thenumber. Look at the ones place.

Round this number to the Round this number to the nearestnearest

ten.ten.

4 or less, just ignore.

8 4 4 Since there is a 4 in the ones place, you “just ignore” and keep the tens

number the same.

Round this number to the Round this number to the nearestnearest

ten.ten.

4 or more, just ignore.

8 4 0 Change the numbers in the

ones place to 0’s and keep the number in the tens place the same.

The AnswerThe Answer

844 rounded to the nearest ten is

840

Round this number to the Round this number to the nearestnearest

hundred.hundred.

Find your number.

7, 2 2 1Circle the number in the hundreds

place.

Round this number to the Round this number to the nearestnearest

hundred.hundred.

Look right next door.

7, 2 2 1Draw an arrow to the right of the

number.

Round this number to the Round this number to the nearestnearest

hundred.hundred.

4 or less, just ignore.

7, 2 2 1

Since 2 is less than 4 we do not changethe 2.

Round this number to the Round this number to the nearestnearest

hundred.hundred.

4 or less, just ignore.

7,2 0 0

Change the numbers to the right of the 2 to 0’s.

The AnswerThe Answer

7221 rounded to the nearest hundred is

7,200

Round this number to the Round this number to the nearestnearest

thousand.thousand.

Find your number.

3 5, 3 2 7Circle 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, 3 2 7Draw 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, 3 2 7

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 right of 5 to 0’s.

The AnswerThe Answer

35,327 rounded to the nearest thousand is

3 5, 0 0 0

Round this number to the Round this number to the nearestnearestdollar.dollar.

Find your number.

$ 5. 8 7

Circle the number where the dollarsare.

Round this number to the Round this number to the nearestnearestdollar.dollar.

Look right next door.

$ 5. 8 7

Draw an arrow to the right of thecircled number.

Round this number to the Round this number to the nearestnearestdollar.dollar.

4 or less, just ignore.

$ 5. 8 78 is greater than 4 so go to the next

line of the poem.

Round this number to the Round this number to the nearestnearestdollar.dollar.

5 or more, add 1 more.

$ 5. 8 7Since 8 is greater than 5 add 1 to the

5.

+1

Round this number to the Round this number to the nearestnearestdollar.dollar.

5 or more, add 1 more.

$ 6. 0 0Change the 5 to a 6 and change all the

numbers to the right to 0’s.

The AnswerThe Answer

$5.87 rounded to the

nearest dollar is

$ 6. 0 0