Math FlashMath FlashRoundingRounding

Objective: TLW round Objective: TLW round numbers to the nearest numbers to the nearest

10 or 100. 10 or 100.

GLE# 12 GLE# 12

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

tens.tens.

Find your number.

6 8Circle the number in the tens

place.

Round this number to the Round this number to the nearestnearest

tens.tens.

Look right next door.

6 8

Draw an arrow to the right of the number.

Round this number to the Round this number to the nearestnearesttens .tens .

4 or less, just ignore.

6 8

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

Round this number to the Round this number to the nearestnearest

tens.tens.

5 or more, add 1 more.

6 8Add 1 to the 6.

+1

Round this number to the Round this number to the nearestnearest

tens.tens.

5 or more, add 1 more.

7 0Add 1 to the 6 and all the numbers

to the right of the 7 become 0’s.

The AnswerThe Answer

68 rounded to the nearest tens is

7 0

Round this number to the Round this number to the nearestnearest

hundred.hundred.

Find your number.

3 2 7Circle the number in the hundreds

place.

Round this number to the Round this number to the nearestnearest

hundred.hundred.

Look right next door.

3 2 7Draw 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.

3 2 7

Since 2 is less than 4 we do not changethe 3.

Round this number to the Round this number to the nearestnearest

thousand.thousand.

4 or less, just ignore.

3 0 0

Change the numbers to right of 3 to 0’s.

The AnswerThe Answer

327 rounded to the nearest hundred is

300

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

Round this number to the Round this number to the nearestnearest

hundreds place.hundreds place.

Find your number.

8 7 1

Circle the number in the hundreds place.

Round this number to the Round this number to the nearestnearest

hundreds place.hundreds place.

Look right next door.

8 7 1Draw an arrow to the right of the

circled number.

Round this number to the Round this number to the nearestnearest

hundreds place.hundreds place.

4 or less just ignore.

8 7 17 is greater than 4 so go to the next

line of the poem.

Round this number to the Round this number to the nearestnearest

hundreds place.hundreds place.

5 or more, add 1 more.

8 7 1Since 7 is greater than 5, add 1 to the

8.

+1

Round this number to the Round this number to the nearestnearest

hundreds place.hundreds place.

5 or more, add 1 more.

900

Change the 8 to a 9 and all the numbers to the right change to zeros.

The AnswerThe Answer

871 rounded to the nearest hundreds place is

900

Remember the poemRemember the poem

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