Question

Add:
$23.456+12$

• A. $35.000$
• B. $35.456$
• C. $12.456$
• D. $33.123$

Answer 1

The correct option is B $35.456$

Let's add 23.456 and 12:

Step 1: Add a decimal point and three zeros to the right of the number 12 to have 3 digits after a decimal point i.e. 12.000 because 23.456 has 3 digits after the decimal point

Step 2: Align the decimal numbers according to their place values one below the other i.e. allign the thousandths digits 6 and 0, allign the hundredths digits 5 and 0, allign the tenths digits 4 and 0, allign the ones digits 3 and 2 and allign the tens digits 2 and 1.
$TO.thth$
$23.456+12.000-------$

Step 3: Add each column of digits, starting on the right.

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

$\therefore 23.456+12=35.456$