Long multiplication with multi-digit numbers

In this exercise you practise long (column) multiplication where both factors have more than one digit. For each digit of the bottom factor you write one partial product, shifted one place to the left. Finally, add the partial products to get the answer.

What does the generator do?

The generator picks two factors with 2–4 digits each (the bottom factor is never longer than the top one). The bottom factor has only non-zero digits so every partial product matters. The partial-product fields are one digit wider than the top factor (to fit the carry from multiplication) and the final-sum field is wide enough to hold the sum of all partial products.

How to use it

Work right to left. First multiply the top factor by the ones digit of the bottom factor and write the result on the first partial-product line. Then by the tens digit – shift the result one place to the left. Continue with hundreds and thousands. Finally, add all partial products column by column and write the answer on the last line. Press “Check”.