Question

The value of $7.2+8.3-3.7-2.8$ is

• A. $7.0$
• B. $8.0$
• C. $9.0$
• D. $10.0$

Answer 1

The correct option is C $9.0$

$7.2+8.3-3.7-2.8=(7.2+8.3)-(3.7+2.8)$

Now, we have two addends term
First add $7.2+8.3:$

Step 1: Align the decimal numbers according to their place values one below the other
$O.t$
$7.2+8.3-----$

Step 2: Add each column of digits, starting on the right.

Finally, place the decimal point of the sum vertically below the other decimal points.


Similarly, now add $3.7+2.8:$
Now, $(7.2+8.3)-(3.7+2.8)=15.5-6.5$

Step 1: Align the decimal numbers according to their place values one below the other.
$TO.t$
$15.5-6.5------$

Step 3: Subtract the numbers in the column from the right.

If needed, borrow a group of ten from the column to the left

Finally, place the decimal point of the sum vertically below the other decimal points.
Hence, $7.2+8.3-3.7-2.8=9.0$