Math Rounding

Math Math RoundingRounding

By Grade 4By Grade 4

Use roundingUse rounding

• When the question asks you

to estimate.

When the question asks “about how many”…?

When an exact answer isn’t possible.

•To check your answer to see if you’ve made a mistake.

Memorize this PoemMemorize this Poem

Find your number.

Look right next door.

4 or less, change to 0’s.

5 or more, add 1 more.

Round the number Round the number 5 5 871 to the nearest871 to the nearest thousandthousand..

Find your number.5 871

Circle the number in thethousands place.

Round the number Round the number 5 5 871 to the nearest871 to the nearest thousandthousand..

Look right next door.

5 871

Draw an arrow to the right of the number.

Round the number Round the number 5 5 871 to the nearest871 to the nearest thousandthousand..

4 or less, change to 0’s.

5 871

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

Round the number Round the number 5 5 871 to the nearest871 to the nearest thousandthousand..

5 or more, add 1 more.5 871

Add 1 to the 5.

. . Round the number Round the number 5 5 871 to the 871 to the nearestnearest

thousandthousand..

5 or more, add 1 more.5 871

Add 1 to the 5.

+1

. . Round the number Round the number 5 5 871 to the 871 to the nearestnearest

thousandthousand..

5 or more, add 1 more.6 000

Add 1 to the 5 ( to make 6) and all the numbers

to the right of the 6 become 0’s.

+1

The AnswerThe Answer

5 871 rounded to the nearest thousand is

6 000

Round the number Round the number 22 317 to the 317 to the nearest nearest thousandthousand..

Find your number.

2 317Circle the number in the thousands

place.

Round the number Round the number 22 317 to the nearest 317 to the nearest

thousandthousand..

Look right next door.

2 317Draw an arrow to the right of the

number.

Round the number Round the number 22 317 to the nearest 317 to the nearest thousandthousand

4 or less, change to 0’s.

2 317

Since 3 is less than 4, we ignore the 2 and change the rest to 0’s.

Round the number Round the number 22 317 to the nearest 317 to the nearest thousandthousand

4 or less, just ignore.

2 0 0 0

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

The AnswerThe Answer

2 327 rounded to the nearest thousand is

2 000

Round the number Round the number 33 5587 to the nearest 87 to the nearest hundredhundred

Find your number.

3 587Circle the number where the hundreds

are.

Round the number Round the number 33 5587 to the nearest 87 to the nearest hundredhundred

Look right next door.

3 587Draw an arrow to the right of the

circled number.

Round the number Round the number 33 5587 to the nearest 87 to the nearest hundredhundred

4 or less, change to 0’s.

3 5878 is greater than 4 so go to the next

line of the poem.

Round the number Round the number 33 5587 to the nearest 87 to the nearest

hundredhundred..

5 or more, add 1 more.

3 587Since 8 is greater than 5, add 1 to the

5.

+1

Round the number Round the number 33 5587 to the nearest 87 to the nearest hundredhundred

5 or more, add 1 more.

3 600Change the 5 to a 6 and change all the

numbers to the right to 0’s.

The AnswerThe Answer

3 587 rounded to the

nearest hundred is

3 600

Round this number to the Round this number to the nearestnearest

tenten..

Find your number.

4 875Circle the number in the tens place.

Round the number 4 8Round the number 4 8775 to the 5 to the nearest ten.nearest ten.

Look right next door.

4 875Draw an arrow to the right of the

circled number.

Round the number 4 8Round the number 4 8775 to the 5 to the nearest ten.nearest ten.

4 8755 is than greater than 4 so go to the next

line of the poem.

Round the number 4 8Round the number 4 8775 to the 5 to the nearest ten.nearest ten.

5 or more, add 1 more.

4 875Since 5 is equal to 5, add 1 to the

7.

+1

Round the number 4 8Round the number 4 8775 to the 5 to the nearest ten.nearest ten.

5 or more, add 1 more.

4 880Change the 7 to a 8 and make the rest 0’s

The AnswerThe Answer

4 875 rounded to the nearest ten is

4 880

Now try some on your own:Now try some on your own:

6 218 rounded to the nearest ten is

_ _ _ _

Now try some on your own:Now try some on your own:

6 218 rounded to the nearest ten is

6 220

Now try some on your own:Now try some on your own:

8 015 rounded to the nearest hundred is

_ _ _ _

Now try some on your own:Now try some on your own:

8 015 rounded to the nearest hundred is

8 000

Now try some on your own:Now try some on your own:

2 495 rounded to the nearest thousand is

_ _ _ _

Now try some on your own:Now try some on your own:

2 495 rounded to the nearest thousand is

2 000

Do these on paper now:Do these on paper now:Round to the nearest 1 000Round to the nearest 1 000

1. 5 7892. 3 4113. 6 2304. 9745. 6 899

Do these on paper now:Do these on paper now:Round to the nearest 1 000Round to the nearest 1 000

1. 5 7892. 3 4113. 6 2304. 9745. 6 899

6 000 3 000 6 000 1 000 7 000

Do these on paper now:Do these on paper now:Round to the nearest 100Round to the nearest 100

1. 5 7892. 3 4113. 6 2304. 9745. 6 899

Do these on paper now:Do these on paper now:Round to the nearest 100Round to the nearest 100

1. 5 7892. 3 4113. 6 2304. 9745. 6 899

5 800 3 400 6 200 1 000 6 900

Do these on paper now:Do these on paper now:Round to the nearest 10Round to the nearest 10

1. 5 7892. 3 4113. 6 2304. 9745. 6 899

Do these on paper now:Do these on paper now:Round to the nearest 10Round to the nearest 10

1. 5 7892. 3 4113. 6 2304. 9745. 6 899

5 790 3 410 6 230 980 6 900