All data on (most) modern machines is composed of ----- (or bits). So a 32-bit number is composed of 32 individual 0 or 1 values. We conventionally write numbers left to right, so typically put the least significant bit on the right and ------ to the left.

It's important to remember that the values stored in a computer are just representations of numbers. In particular, since we store a fixed number of bits, it is possible for arithmetic operations to ----- : for the result of the computation to have too large a ---- to be represented with the bits available.