Eng:() * () (block)

The  *  block is an Operators block and a Reporter block. The block multiplies the two values and reports the result. In Snap!, it will be shown as ×.

The numbers can be typed directly into the block, or Reporter blocks can be used instead.

This block can be stacked inside itself - this can be used to fit more numbers in or calculate exponents.

Example Uses
In many projects, numbers must be multiplied; this block will do the job.

Some common uses for the *  block: set [result v] to ((a) * (b)) set [result v] to (1) set [item v] to (1) repeat (length of [numbers v]) set [result v] to ((result) * (item (item) of [numbers v])) change [item v] by (1) end ([sqrt v] of ((((y1) - (y2)) * ((y1) - (y2))) + (((x1) - (x2)) * ((x1) - (x2))))) //Pythagorean Theorem set [score v] to ((score) * (2)) when gf clicked set [velocity v] to [0] forever if  then change [velocity v] by (2) set [velocity v] to ((velocity) * (0.87)) //simulates friction slowdown
 * Scripts in calculator simulations
 * Multiplying lists of numbers
 * Math formulas
 * Score multipliers
 * Velocity
 * 3D Projects

Scientific Notation
In Scratch 1.4 and previous versions, it sometimes converts very large numbers into scientific notation to save space. Scientific notation is simply the number in the form a*10b. These can be converted to a normal number by performing any mathematical function on it, such as adding. So if a variable named "number" has a value of 3*103 and you want to display it as a normal number, you can change it by: ((number) + (0)) It will then report "3000".

Workaround
With natural numbers, this block can be replicated with the following code, assuming a is the first number and b is the second number: set [product v] to [0] repeat (b) change [product v] by (a)

The following code works for all cases (with the conditional). It divides by the reciprocal, the equivalent of multiplying. if <(b) = (0)> then set [product v] to [0] else set [product v] to ((a) / ((1) / (b))) end

The following code accepts negative numbers with decimals:

delete (all v) of [num1 numbers v] //setup delete (all v) of [num2 numbers v] delete (all v) of [product digits v] set [product v] to [0] set [dec pos 1 v] to [0] set [dec pos 2 v] to [0] ask [num1] and wait if <(answer) < [0]> then set [count v] to [1] set [no 1 negative v] to [y] else set [count v] to [0] set [no 1 negative v] to [n] end repeat (length of (answer)) change [count v] by (1) if > then add (letter (count) of (answer)) to [num1 numbers v] else set [dec pos 1 v] to ((length of (answer)) - (count)) end end ask [num2] and wait if <(answer) < [0]> then set [count v] to [1] set [no 2 negative v] to [y] else set [count v] to [0] set [no 2 negative v] to [n] end repeat (length of (answer)) change [count v] by (1) if > then add (letter (count) of (answer)) to [num2 numbers v] else set [dec pos 2 v] to ((length of (answer)) - (count)) end end set [num1 v] to (num1 numbers) set [num2 v] to (num2 numbers) repeat (num1) //start change [product v] by (num2) end set [decimal position v] to ((dec pos 1) + (dec pos 2)) set [count v] to [0] repeat (length of (product)) change [count v] by (1) add (letter (count) of (product)) to [product digits v] end if > then insert [.] at ((length of [product digits v]) - ((decimal position) - (1))) of [product digits v] end if <<<(no 1 negative) = [y]> or <(no 2 negative) = [y]>> and  and <(no 2 negative) = [y]>>>> then insert [-] at (1 v) of [product digits v] end set [product v] to (product digits)