Grade 2 Math Numbers on Abacus
Numbers on Abacus
Representing
Numbers on Abacus:
We can represent numbers on abacus. To represent 3 digits number, we can show the number on an abacus with three vertical rods. In an abacus, every road’s beads represent the place value of hundred or tens or ones. We can maximize or minimize the beads to represent a number. A road cannot hold more than 9 beads.
Example:
Look
at the abacus.
In
hundreds place, beads number = 7
So,
the place value of 7 = 7╳100 =
700
In
tens place, beads number = 6
So,
the place value of 6 = 6╳10 = 60
In
ones place, beads number = 5
So,
the place value of 5 = 5╳1 = 5
∵ The number is 765.
Place
Value Calculation of Abacus:
1
bead on hundreds place = 1╳100 = 100 ……(i)
2
beads on hundreds place = 2╳100 = 200
3
beads on hundreds place = 3╳100 = 300
1
bead on tens place = 1╳10 =
10
2
beads on tens place = 2╳10 =
20
3
beads on tens place = 3╳10 =
30
10
beads on tens place = 10╳10 =
100……(ii)
So,
from equations (i) and (ii), we get,
10
beads on tens place = 1 bead on hundreds place
So,
regroup 10 tens to 1 hundred.
1. Find the numbers from the following abacus and write the number names.
Solution:
In
picture 1:
H = 1
T = 2
O = 2
So,
the number = 122
∵ Number name = One hundred twenty-two
In
picture 2:
H = 3
T = 1
O = 3
So,
the number = 313
∵ Number name = Three hundred thirteen
In
picture 3:
H = 4
T = 3
O = 5
So,
the number = 434
∵ Number name = Four hundred thirty-four
2. Read the abacus and fill in the blanks.
Answer:
(1.)
1 Hundred
1 Ten
2
Ones
(2.)
3 Hundreds
1 Ten
3
Ones
(3.)
3 Hundreds
3 Ten
4
Ones