Commas
a re
u sed
i n
n umbers
w ith
4
o r
m ore
d igits
t o
m ake
t hem
e asier
t o
r ead.
To
p lace
c ommas
i n
l arge
n umbers,
s tart
f rom
t he
r ight
s ide
a nd
m ove
3
s paces
t o
the
l eft.
Example:
Look
a t
t he
p lace
v alue
m odels.
W hat
n umber
i s
s hown?
1
t housand
4
h undreds
5
t ens
3
o nes
Standard
f orm:
1 ,453
It
i s
r ead:
o ne
t housand,
f our
h undred
f ifty-‐three
The
w ord
A ND
i s
n ot
u sed
w hen
y ou
r ead
n umbers.
The
v alue
o f
t he
d igit
1
i s
1 000.
T he
v alue
o f
t he
4
i s
4 00.
T he
v alue
o f
the
5
i s
5 0.
T he
v alue
o f
t he
3
i s
3 .
The
e xpanded
f orm
i s:
1,000
+
4 00
+
5 0
+
3
=
1 ,453
Example:
Write
t he
w ord
n ames
f or
t he
f ollowing
n umbers.
a. 7
b.
2 0
c.
6 5
d.
1 ,024
a. seven
b.
t wenty
c.
s ixty-‐five
d.
o ne
t housand,
t wenty-‐four
In
t he
n umber
1 ,024,
a
z ero
i s
u sed
a s
a
p laceholder
i n
t he
s tandard
form
o f
t he
n umber
t o
s how
n o
h undreds.
H owever,
t he
z ero
i s
implied,
b ut
n ever
w ritten,
i n
t he
w ord
n ame.
Module
1 :
R eading
a nd
W riting
R eal-‐Life
N umbers
5