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.
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.
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.
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
Round this number to the Round this number to the nearestnearest
hundreds.hundreds.
125 767 1,580990 231 7,632
Go for it!