Numbering is needed on many documents: invoices, receipts and draw or raffle tickets being the best examples.
Sequential numbering printing refers to printing numbers in sequential order on sets of forms or other printed pieces. Each form or piece gets a unique number and is printed in either ascending or descending numerical order. Numbering is commonly used on carbonless forms, also known as NCR forms like invoices, purchase orders, contracts, etc. It can also be used on other printed items like raffle tickets where you need a unique identifying number.