Definitions of Decimal
Decimal are numbers with decimal point and decimal places.
Kinds of Decimals
Classifications Definition Examples
1. Terminating decimal A decimal that ends or terminates. 0.25, 0.50, 0.75 and 0.80.
2. Nonterminating decimal A decimal number that does not end. 0.666666…., 0.123123….
FOUR OPERATIONS OF DECIMALS
Adding Decimals
Rules Examples
Add decimals the same way as Example # 1: Find the sum
you add whole numbers. Write a. 7.5 + 1.75
the digits in columns and align b. 0.75+6+0.345
the decimal point. For Solution:
convenience, zeros may be 1.5 0.75
appended so that numbers may + .75 0.345
have the same number of places. 2.25 1.095
Then add the digits from right to Problem Solving:
left. Teresa went to shop materials for her scrapbook. She got the
scrapbook for 220.25 ball point pen at 16.75, and scrapbook decors
at 90.50. How much did he pay for the materials?
Solution:
220.75
16.75
+ 90.50
347.50
Subtraction of Decimal
Write the number to be subtracted Example:
below the other number. Just like Richard runs on some mornings before he goes to work. Below is the table
in addition, keep the decimal of the number of kilometer he ran during the week.
point in the line. It is advised that
the decimal have the same Monday Wednesday Friday Sunday
number of decimal places. If not, Number of 1.5 2.471 4.95 0.73
kilometer
add zero to the fewer decimal
places.
Solution: His goal for the week is to run 10m kilometers. Did Richard
meet his running goal for the week? How many kilometers does Richard
requires to have to meet his running goal?
Solution:
1.500
2.471
4.950
+ 0.730
9.651
Thus, 10,000-9.651=0.349-Richard needs to run 0.349 kilometer more
to meet his running goal.
Decimal are numbers with decimal point and decimal places.
Kinds of Decimals
Classifications Definition Examples
1. Terminating decimal A decimal that ends or terminates. 0.25, 0.50, 0.75 and 0.80.
2. Nonterminating decimal A decimal number that does not end. 0.666666…., 0.123123….
FOUR OPERATIONS OF DECIMALS
Adding Decimals
Rules Examples
Add decimals the same way as Example # 1: Find the sum
you add whole numbers. Write a. 7.5 + 1.75
the digits in columns and align b. 0.75+6+0.345
the decimal point. For Solution:
convenience, zeros may be 1.5 0.75
appended so that numbers may + .75 0.345
have the same number of places. 2.25 1.095
Then add the digits from right to Problem Solving:
left. Teresa went to shop materials for her scrapbook. She got the
scrapbook for 220.25 ball point pen at 16.75, and scrapbook decors
at 90.50. How much did he pay for the materials?
Solution:
220.75
16.75
+ 90.50
347.50
Subtraction of Decimal
Write the number to be subtracted Example:
below the other number. Just like Richard runs on some mornings before he goes to work. Below is the table
in addition, keep the decimal of the number of kilometer he ran during the week.
point in the line. It is advised that
the decimal have the same Monday Wednesday Friday Sunday
number of decimal places. If not, Number of 1.5 2.471 4.95 0.73
kilometer
add zero to the fewer decimal
places.
Solution: His goal for the week is to run 10m kilometers. Did Richard
meet his running goal for the week? How many kilometers does Richard
requires to have to meet his running goal?
Solution:
1.500
2.471
4.950
+ 0.730
9.651
Thus, 10,000-9.651=0.349-Richard needs to run 0.349 kilometer more
to meet his running goal.
