1–4
Name
Date
The Abacus
Long before place-value charts were invented, people used a tool called an abacus
to show numbers. Each rod of beads on an abacus stands for one place value.
Each bead worth 5 units
Center bar
To read numbers on an
abacus, count the beads
moved to the center bar
in each place value.
hu
nd
re
d
te thou
n
th san
ou d
th san s
ou d
s
hu sand
nd s
re
ds
te
ns
on
es
Each bead worth 1 unit
539,047
1.
2.
3.
4.
5.
On a separate sheet of paper, draw an abacus to show the number 605,927.
Copyright © Houghton Mifflin Company. All rights reserved.
Write the number shown on each abacus in standard form.
1–4
Name
Date
The Abacus
Long before place-value charts were invented, people used a tool called an abacus
to show numbers. Each rod of beads on an abacus stands for one place value.
Each bead worth 5 units
Center bar
To read numbers on an
abacus, count the beads
moved to the center bar
in each place value.
hu
nd
re
d
te thou
n
th san
ou d
th san s
ou d
s
hu sand
nd s
re
ds
te
ns
on
es
Each bead worth 1 unit
539,047
Write the number shown on each abacus in standard form.
2.
142,097
3.
4.
901,435
5.
258,160
563,078
On a separate sheet of paper, draw an abacus to show the number 605,927.
Check students’ drawings.
Copyright © Houghton Mifflin Company. All rights reserved.
1.