Some quick review of multiplication vocabulary for you: Factors are the numbers that are actually being multiplied. The product is the final answer when the multiplication operation is calculated. The multiplicand is the number that is getting multiplied, in vertical multiplication it is often the top number. The multiplier is the number you multiplying the multiplicand by. You guessed it, in vertical multiplication the multiplier is usually the bottom number.
These worksheets explain how to do multiplication using three- and four-digit numbers. Long-form multiplication is demonstrated, but instructors may allow students to use calculators if desired.