Transcript Rounding lesson - Allentown School District

Rounding
For Second Grade
When do you use rounding?
•When the question asks you to
round.
•When the question asks you to
estimate.
• When the question asks “about
how many”…?
• To find out ABOUT what your
answer should be.
Memorize 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 nearest
ten.
Find your number.
978
Circle the number in the tens
place.
Round this number to the nearest
ten.
Look right next door.
978
Draw an arrow to the right of the
number.
Round this number to the nearest
ten.
4 or less, just ignore.
978
8 is larger than 4 so go to the
next line of the poem.
Round this number to the nearest
ten.
5 or more, add 1 more.
+1
978
Add 1 to the 7.
Round this number to the nearest
ten.
5 or more, add 1 more.
980
Add 1 to the 7 and all the
numbers to the right of the 8
become 0’s.
The Answer
978 rounded to the
nearest ten is
980
Round this number to the nearest
hundred.
Find your number.
327
Circle the number in the hundreds
place.
Round this number to the nearest
hundred.
Look right next door.
327
Draw an arrow to the right of the
number.
Round this number to the nearest
hundred.
4 or less, just ignore.
327
Since 2 is less than 4 we do
not change the 3.
Round this number to the nearest
hundred.
4 or less, just ignore.
300
Change the numbers to right
of 3 to 0’s.
The Answer
327 rounded to the
nearest hundred is
300
Let’s practice
Practice 1
Practice 5
Practice 2
Practice 6
Practice 3
Practice 7
Practice 4
Practice 8
Practice 9
Bonus: See how
to round money
Round this number to the nearest
ten.
564
A. 560
B. 500
C. 570
D. 600
Round this number to the nearest
hundred.
1,792
A. 1,700 B. 1,790
C. 1,800 D. 2,000
Round this number to the nearest
ten.
406
A. 400
B. 500
C. 410
D. 600
Round this number to the nearest
hundred.
714
A. 720
B. 710
C. 800
D. 700
Round this number to the nearest
ten.
227
A. 200
B. 230
C. 220
D. 300
Round this number to the nearest
hundred.
1,131
A. 1,130 B. 100
C. 1,100 D. 1,200
Round this number to the nearest
ten.
911
A. 910
B. 920
C. 900
D. 1,000
Round this number to the nearest
hundred.
952
A. 900
B. 1,000
C. 950
D. 960
Round this number to the nearest
ten.
797
A. 790
B. 700
C. 800
D. 710
You got it right!
Good Work!
Sorry, try again
Round this number to the nearest
dollar.
Find your number.
$ 5. 8 7
Circle the number where
the dollars are.
Round this number to the nearest
dollar.
Look right next door.
$ 5. 8 7
Draw an arrow to the right of
the circled number.
Round this number to the nearest
dollar.
4 or less, just ignore.
$ 5. 8 7
8 is greater than 4 so go to the
next line of the poem.
Round this number to the nearest
dollar.
5 or more, add 1 more.
+1
$ 5. 8 7
Since 8 is greater than 5 add 1
to the 5.
Round this number to the nearest
dollar.
5 or more, add 1 more.
$ 6. 0 0
Change the 5 to a 6 and change all
the numbers to the right to 0’s.
The Answer
$5.87 rounded to the
nearest dollar is
$ 6. 0 0
That’s all, folks!!!