Computer Science for IGCSE & O level - Algorithm Design And Problem Solving (Section 8 - No. 44)
The procedure for check digits often involves these operations:
Adding, subtracting, and dividing.
Multiplying, dividing, and adding.
Multiplying, adding, and dividing.
Dividing, multiplying, and subtracting.
הֶסבֵּר
The standard procedure.