Brain Buster Multiplication

Anybody and everybody is welcome to take a quiz it's all free and open but only logged in users will have their results saved, receive detailed feedback and be able to participate in the leaderboards.

The most difficult multiplication questions with longer decimals and numbers
Notes:
Multiply can be written as: x or *
Any number multiplied by 0 is 0 -> 200 * 0 = 0
Any number multiplied by 1 stays the same -> 200 × 1 = 200
When a number is multiplied by two we are doubling the number. 200 × 2 = 400
When a whole number is multiplied by 10 we can simply add a 0 to the end because there is one zero in 10 -> 200 × 10 = 2000
When multiplying by 100 we add two zeros to the end

Also remember the sign rules:
Positive x Positive = Positive
Negative x Negative = Positive
Positive x Negative = Negative
Negative x Positive = Negative

Multiplying decimals:
Starting on the right, multiply each digit in the top number by each digit in the bottom number, just as with whole numbers.

-0.1 (1 decimal place)
x 0.4 ( 1 decimal place)
= 0004

Place the decimal point in the answer by starting at the right and moving a number of places equal to the sum of the decimal places in both numbers multiplied. One of the numbers was negative so the answer will be negative

= -0.04