ADDING AND SUBTRACTING
RATIONAL NUMBERS
Change each mixed fraction to improper
fraction.
1
1.3
3
7
2.5
10
2
3.1
5
5 10 15 20 25 30 35 40
The LCM of 5
and 7 is 35.
7 14 21 28 35 42 49
10 20 30 40 50 60 70
The LCM of 10
and 3 is 30.
3 6 9 12 15 18 21 24 27 30
List all the multiples of each number and
encircle
their
LEAST
COMMON
MULTIPLE.
1.4 and 5
2.3 and 10
3.8 and 6
Perform the indicated operations.
3
1. 4
+
1
3
2
5
2. 3 +
3.
1
6
4. 3
1
6
5. (8
1
8
7
5
10
2
3
3
+ )
8
-
5
6
Consider the menu board shown below.
SNACKS
Egg
P18.50
Sandwich
Spaghetti P22.75
Fruit Juice P11.25
Iced Tea P10.50
Suppose you are
buying one egg
sandwich and one
fruit juice, how
much will be your
change if you pay
P50.00
Solve the following problem.
1. A carpenter needs a 40 ¾ cm piece of wood. How much is left after
he cut off the needed material from 96-cm piece of wood?
2. A biscuit factory originally packaged 0.65 kg of crackers. To increase
profitability, the company reduced the weight by 0.035 kg with a
more affordable price. What is the new weight per pack of crackers?
3. Faye won a cash prize in a noontime show. She gave half of the
money to her mother. She then spent P1200.50 for school bag and
shoes, and put the remaining P3475.50 to her savings account. How
much money did she win?