The arcade-style scoring provides an incentive for decreasing the amount of time, since lower time settings increase the possible scores. Also useful for learning to recognize the number of objects at a glance without actually counting them. Great confidence builder. Fits right in with children who are taught using finger-counting techniques. Also includes a teaching mode for Registered Users.
Problems involve carrying, borrowing and remainders.
Registrants will receive, free of charge, similar stacks for subtraction, multiplication and division. These will be sent as a e-mail attachment after I get confirmation of your registration from Kagi Shareware. Has something for pre-schoolers, too. Free to individuals and non-profits.