Lesson 3: Adding 0 and 1, 2, 3, or 4
Rule 1: Adding
1, 2, 3, or 4. Use the right thumb moves
up 1, 2, 3, or 4
beads.
0
0 + 1 = 1
0
+ 1 = 1 1
+ 0 = 1
0 + 2 = 2
0
+ 2 = 2 2
+ 0 = 2
0 + 3 = 3
0
+ 3 = 3 3
+ 0 = 3
0 + 4 = 4
0
+ 4 = 4 4
+ 0 = 4
Exercise 3: Adding 0 and 1, 2, 3, or 4
(1)
Answer the penguin’ s question. Draw the
answer on the abacus.
1
+ 0 = ____
0
+ 3 = ____
0
+ 0 = ____
(2)
Write answers.
0 +
1 = 0 + 2 = 0 + 3 = 0 + 4 =
1 +
0 = 2 + 0 = 3 + 0 = 4 + 0 =
0 +
0 + 0 = 1 + 0 + 0 = 2 + 0 + 0 = 3 + 0 + 0 =
Lesson 10: Word Problems.
(1)
Two
cats are at the left and two at
cats are at the right. How
many
cats are there in all?
2 + 2 = 4
(2)
One
bear is in the box and two
bears are outside the box. How
many bears are there in all?
1 + 2 = 3
(3)
One egg is in the box and three
eggs are outside the 
box. How
many more eggs outside the
box than in
the box?
3 – 1 = 2
Exercise 10: Word Problems
(1)
Two cats are at the left and
two cats are at the right. How
many cats are there in all?
_____ + _____ = _____
(2)
One
fish is in the box and two
fishes are in a circle. How
many fishes are there in all?
_____ + _____ = _____
(3)
One fish
is on the top and three
fish are at the bottom. How many
fish are there in all?
_____ + _____ = _____
(4)
Three eggs are in the box and one
eggs is on the ground. How many
are there 
in all?
_____ + _____ = _____
(5)
There
are three rose fish and two
blue fish. How many more rose
fish are there than blue fish?
_____
– _____ = _____
(6)
There
are two purple crabs and one
brown crab. How many more purple
crabs are there than brown crabs?
_____
– _____ = _____
(1)
Three whales are chasing one
squid. How many more whales
are there than the octopus?
_____
– _____ = _____