Math FlashMath FlashRoundingRounding

By Mrs. TurnerBy Mrs. Turner

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.

Round this number to the Round this number to the nearestnearest

ten.ten.

Find your number.3 8 7

Circle the number in the tens place.

Round this number to the Round this number to the nearestnearest

ten.ten.

Look right next door.

3 8 7

Draw an arrow to the right of the number.

Round this number to the Round this number to the nearestnearest

ten.ten.

4 or less, just ignore.

3 8 7

7 is larger than 4 so go to the nextline of the poem.

Round this number to the Round this number to the nearestnearest

ten.ten.

5 or more, add 1 more.

3 8 7Add 1 to the 8.

+1

Round this number to the Round this number to the nearestnearest

ten.ten.

Try this one!

3 7 3What will you do? Think about the poem.

The AnswerThe Answer

373 will be rounded to 370. The number 3 is less than 4.

Round this number to the Round this number to the nearestnearest

hundred.hundred.

Find your number.

5 4 5

Circle the number in hundreds place.

Round this number to the Round this number to the nearestnearest

hundred.hundred.

What shall it be?

Does 545 round to 500

or 600?

Round this number to the Round this number to the nearestnearest

thousand.thousand.

Clue: 4 or less, just ignore!

5, 3 2 7

What do you think?

Round this number to the Round this number to the nearestnearest

hundred.hundred.

Clue: 4 or less, just ignore.

5, 2 3 5Remember to change the numbers to right of 5 to 0’s.

The AnswerThe Answer

5,235 rounded to the nearest hundred is

5,200

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

Find your number.

$ 5. 8 7

Circle the number where the dollars are.

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

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

Find your number.

$ 6. 32Circle the number in the dollars place.

Now you try some.Now you try some.

Round to the nearest ten.

Draw an arrow to the right of thecircled number.

23 45 125 90

How did you do?How did you do?

23-2045-50

125 – 13090-90

Did you remember the poem?

Round this number to the Round this number to the nearestnearest

hundreds.hundreds.

125 767 1,580990 231 7,632

Go for it!

Let’s CheckLet’s Check

123 -100 767-800

1,580-1,600 231-200990-1,000 7,632-7,600

Don’t forget to use the poem to Don’t forget to use the poem to help you when rounding.help you when rounding.

Find your number.Look right next door.4 or less just ignore.

5 or more, add 1 more.