SaiBook.us Decimals

Lesson Example Discussion Quiz: Class Homework

Example

Title: Decimal Subtraction

Grade: 5-a Lesson: S1-L5

Explanation: The best way to understand decimals is by looking at some examples. Take turns and read each example for easy understanding.

Examples:

Subtract the following decimals 687.48 - 345.25

Step 1a

Arrange the decimals one under the other with the decimal point vertically.

$1a$

Explanation: The given decimals are 687.48 and 345.25, which are like decimals, since each decimal contains one decimal point.

Step 1b

Start subtracting from the rightmost digit and move toward the leftmost digit. Subtract the hundredth and tenth decimal values in the rightmost column. Subtract the hundredth-place digits (8 - 5 =3) and the tenth-place digits (4 - 2= 2). Write the value 3 in the hundredth column and the value 2 in the tenth column.

$1b$

Explanation: In this step, subtract the hundredth and tenth decimal values in the rightmost column. Subtract the hundredth-place digits which is (8 - 5 =3) and the tenth-place digits (4 - 2= 2). Place the value 3 in the hundredth column and place the value 2 in the tenth column.

Step 1c

Move to the next column by one’s place in the whole number subtract the digits 7 - 5=2, and write 2 in one’s column

$1c$

Explanation: In this step, subtract the next column in one’s place digits of the whole number which is 7 - 5=2. Place the 2 in the one’s column.

Step 1d

Move to the next column by ten’s place in the whole number subtract the digits 8 - 4=4, and write 4 in ten’s column

$1d$

Explanation: In this step, subtract the next column in ten’s place digits of the whole number which is 8 - 4=4. Place the 4 in the ten’s column.

Step 1e

Move to the next column by hundred’s place in the whole number subtract the digits 6 - 3=3, and write 3 in the hundred’s column

$1e$

Explanation: In this step, subtract the next column in hundred’s place digits of the whole number which is 6 - 3=3. Place the 3 in the hundred’s column.

Step 1f

Therefore, the result of subtracting 345.25 from 687.48 is 342.23.

$1f$

Explanation: Hence, the result of 687.48 - 345.25 = 342.23