The method used to add whole numbers applies to adding decimals. Be
sure to line up the decimal points. You may want to append zeros to
the addend that has less decimal places so that it is easier for you
to line up the decimal points. Write the decimal point for the result
in the same place as in the addends.
In case you still need it, the following is the addition table.
Addition Table

0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
0 
0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
1 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
2 
2 
3 
4 
5 
6 
7 
8 
9 
10 
11 
3 
3 
4 
5 
6 
7 
8 
9 
10 
11 
12 
4 
4 
5 
6 
7 
8 
9 
10 
11 
12 
13 
5 
5 
6 
7 
8 
9 
10 
11 
12 
13 
14 
6 
6 
7 
8 
9 
10 
11 
12 
13 
14 
15 
7 
7 
8 
9 
10 
11 
12 
13 
14 
15 
16 
8 
8 
9 
10 
11 
12 
13 
14 
15 
16 
17 
9 
9 
10 
11 
12 
13 
14 
15 
16 
17 
18 
Example:
what is the sum of 2.89 and 0.617?

First, we append a zero at the end of 2.89 in order to line up 2.89
and 0.617 so that their decimal points are at the same column. Then
we do the column addition in the same way as we do column addition
for whole numbers. Finally, we put a decimal point in the result at
the same place as in the addends. 
The method used to subtract whole numbers applies to subtracting
decimals. Be sure to line up the decimal points. You may want to
append zeros to the minuend or the subtrahend that has less decimal
places so that it is easier for you to line up the decimal points.
Write the decimal point for the result in the same place as in the
minuend and the subtrahend.
Example:
what is the difference of 2.89 and 3.617?
Since 2.89 is less
than 3.617, we are going to calculate 3.617  2.89 = ?

First, we append a zero at the end of 2.89 in order to line up 2.89
and 0.617 so that their decimal points are at the same column. Then
we do the column subtraction in the same way as we do column
subtraction for whole numbers. Finally, we put a decimal point in
the result at the same place as in the addends. 
The only difference between multiplying decimals and multiplying whole
numbers is that you need to place the decimal point somewhere in the
result. You do not line up the decimal points here. Instead, you count
how many decimal places the multiplicant has and how many decimal
places the multiplier has. The number of decimal places should be the
sum of the number of decimal places in the multiplicant and the number
of decimal places in the multiplier.
In case you still need it, the following is the multiplication table.
Multiplication Table

0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
0 
1 
0 
1 
2 
3 
4 
5 
6 
7 
8 
9 
2 
0 
2 
4 
6 
8 
10 
12 
14 
16 
18 
3 
0 
3 
6 
9 
12 
15 
18 
21 
24 
27 
4 
0 
4 
8 
12 
16 
20 
24 
28 
32 
36 
5 
0 
5 
10 
15 
20 
25 
30 
35 
40 
45 
6 
0 
6 
12 
18 
24 
30 
36 
42 
48 
54 
7 
0 
7 
14 
21 
28 
35 
42 
49 
56 
63 
8 
0 
8 
16 
24 
32 
40 
48 
56 
64 
72 
9 
0 
9 
18 
27 
36 
45 
54 
63 
72 
81 
Example:
what is the product of 2.89 and 0.63?

First, forget about the decimal points and just do multiplication as
if you were multiplying whole numbers. After that is done, count the
number of decimal places in 2.89 and 0.63. Since 2.89 has two
decimal places and 0.63 also has two decimal places, the product
will have two plus two, which is four, decimal places. Therefore,
you put a decimal point between 1 and 8 in the product and get the
final answer : 1.8207 . 
Tricks and Tips 
When you multiply a decimal by 10,
move the decimal point one place to the right. When you
multiply a decimal by 100, move the decimal point two places to the
right. When you multiply a decimal by 1000, move the
decimal point three places to the right.

When dividing decimals, we first transform the divisor to a whole
number by multiplying the divisor by a multiple of 10 and we also
multiply the divisor by the same multiplier so that we will get the
correct answer. Then we start the long division in the same way as we
divide whole numbers. When you reach the decimal point of the
dividend, put a decimal point in the quotient at the same place as in
the dividend. You can always append zeros to the dividend to make up
more decimal palces. Keep doing the long division until there is no
remainder or there are enough decimal places in the quotient to meet
the accuracy requirement of the problem.
Example:
how much is 6.21 divided by 0.95 ? Round the quotient to the closest
thousandths.

Firstly, we multiply the divisor 0.95 by 100 to make it a whole
number. Of course we need to do the same thing about the dividend,
i.e., multiply 6.21 by 100 to get 621 . Now we start the long
division. Since 62 is smaller than 95, we need to move to the next
digit to get started. After some trying, we know that 95 multiplied
by 6, which is 570, gives us the closest product to 621 and the
remainder is 51 . If you were doing long division for whole numbers,
you would stop here. But since you are dealing with decimals now,
you need to go on. Put a decimal point at the end of 621 and append
zeros to it. Also put a decimal point in the quotient at the same
place. Then keep doing the long division until the remainder is zero
or you reached the tenthousandths place. It turns out that there is
still a remainder after you get the digit in the tenthousandths
place. At this point, you have 6.5368 as the quotient, which can be
rounded to 6.537 . 
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