math flash rounding objective: tlw round numbers to the nearest 10 or 100. gle# 12
TRANSCRIPT
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.