Sometimes, when yo multiply a decimal in Scratch, you get a repeating decimal with endless 9s or 0s. For example, 0.2 x 3 is actually 0.6, but in Scratch, it's 0.6000000000000000001. Please fix!

Basically, what's happening is known as a floating point error since the program isn't able to accurately store the number 0.2. While you usually don't have to worry about stuff like this with Scratch due to the lack of data types (integers, floats etc.), this is a case where it's quite important to know what's going on. Computers with their binary number system aren't that great at storing decimals, much like how we with our decimal system can't accurately show 1/3 as a number without appromixating (e.g 0.33, which isn't actually 1/3 but is close enough).

A way to fix this issue would be to multiply the number by a factor of 10 so that all of the numbers that we care about are on the left side of the decimal place, round the number and then divide it by that factor of 10, which you can make with this script:

((round (((a) * (b)) * (10))) / (10)) // a and b being the two numbers you want to multiply, the 10 shifts the number one place to the left for rounding

Also, numbers with more than 15 digits (such as 1928328167543661), numbers whose place is over 15 will be displayed as a 0. Then, it becomes 1928328167543660.