Multiplying decimals with three decimal places by whole numbers

Example

(a) 327.425 × 7 = (b) 27.321 × 33 =

Solution

(a) 327.425 × 7 =

Multiply 327435 by 7, then indicate three decimal places by counting digits of the answer from right.

   327435
×      7
-------
 2292045

327435 × 7 = 2292045

After indicating three decimal places, the answer is 2292.045.

Therefore, 327.425 × 7 = 2292.045.

Solution

(b) 27.321 × 33 =

Multiply 27321 by 33, then indicate three decimal places by counting digits of the answer from right.

   27321
×    33
-------
   81963
+ 81963
-------
  901593

27321 × 33 = 901593

After counting three decimal places, the answer is 901.593.

Therefore, 27.321 × 33 = 901.593