Reading And Writing Real-Life Numbers Worksheet Page 16
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28PART
5
Rounding
N umbers
When
y ou
a re
r ounding
a
n umber
t o
t he
n earest
1 0,
y ou
a re
t rying
t o
f ind
o ut
which
m ultiple
o f
1 0
t he
n umber
i s
c losest
t o.
T he
r ule
i s
t hat
i f
a
n umber
i s
exactly
h alfway
b etween
t wo
m ultiples
o f
1 0,
y ou
a lways
r ound
u p.
Look
a t
t he
o nes
d igit:
• If
i t
i s
l ess
t han
5
t hen
r ound
t he
n umber
d own
b y
c hanging
t he
o nes
d igit
to
z ero.
• If
i t
i s
5
o r
m ore
t han
r ound
t he
n umber
u p
b y
a dding
o ne
t o
t he
t ens
d igit
and
c hanging
t he
o nes
d igit
t o
z ero.
• 38
r ounds
u p
t o
4 0
b ecause
t he
o nes
d igit
i s
8 .
• 64
r ounds
d own
t o
6 0
b ecause
t he
o nes
d igit
i s
4 .
• 135
r ounds
u p
t o
1 40
b ecause
t he
o nes
d igit
i s
a
5 .
Example:
There
a re
e xactly
5 8
a ction
m ovie
t apes
i n
t he
D VD
l ibrary.
I f
y ou
d o
not
n eed
t o
k now
t he
e xact
n umber
o f
t apes,
y ou
c an
r ound
5 8
t o
the
n earest
t en.
You
c an
u se
a
n umber
l ine
t o
h elp
y ou.
I-‐-‐-‐-‐-‐-‐I-‐-‐-‐-‐-‐-‐I-‐-‐-‐-‐-‐-‐I-‐-‐-‐-‐-‐-‐I-‐-‐-‐-‐-‐-‐I-‐-‐-‐-‐-‐-‐I-‐-‐-‐-‐-‐-‐I-‐-‐-‐-‐-‐-‐I-‐-‐-‐-‐-‐-‐I-‐-‐-‐-‐-‐-‐I
50
5 1
5 2
5 3
5 4
5 5
5 6
5 7
5 8
5 9
6 0
58
i s
b etween
5 0
a nd
6 0.
58
i s
c loser
t o
6 0.
There
a re
a bout
6 0
a ction
m ovie
t apes
i n
t he
v ideo
l ibrary.
Module
1 :
R eading
a nd
W riting
R eal-‐Life
N umbers
16
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