Question

Guess the answer of the multiplication 399 x 3.

• A. More than 900
• B. Less than 1500
• C. Less than 1200
• D. More than 1200

Answer 1

The correct option is C Less than 1200

To get the idea of multiplication we can simplify the number a bit so to guess 399 x 3 we can use 400 in place of 399 since 400 x 3 is easier to calculate.
400 x 3 = (4 x 3) x 100
= 12 x 100
= 1200
Since 399 is less than 400 so 399 x 3 will also be less than 400 x 3.
So 399 x 3 will be less than 1200.