Multiply two numbers with a full column-by-column working showing every partial product.
Long multiplication breaks a multiplication into partial products — one for each digit of the multiplier. Each partial product is the multiplicand times one digit, shifted left by the digit's place value. The final answer is the sum of all partial products.
Long Multiplication
Product = sum of (multiplicand × each digit of multiplier × place value of that digit)
Each digit in the multiplier represents a different place value (ones, tens, hundreds…). Shifting left is equivalent to multiplying by 10, 100, etc.
Yes — compute the product of the absolute values, then apply the sign rule: negative × positive = negative, negative × negative = positive.