【實用教育app】Roman Numerals Quiz Master|最夯免費app-綠色工廠好玩App

Roman Numerals Quiz Master is a multiple-choice based quiz program for converting Roman Numerals to Arabic Numerals, and vice versa. Brief Roman Numerals Introduction: Roman numerals are made up with the following letters:* I : 1* V : 5* X : 10* L : 50* C : 100* D : 500* M : 1000 The calculation of its numeric value follows these two principles: - The Additive Principle: The value of a Roman Numeral is calulated by adding up all the digits, with the largest numbers on the left, down to the smallest on the right. For example, CLXXVII = 100 + 50 + 10 + 10 + 5 + 1 + 1 = 178.- The Subtractive Principle: Some numbers can be written with a smaller numeral on the left of a larger numeral, which requires subtraction. This provides a shortcut that saves writing space. For example, the value 4 is written as IV (i.e. 5 - 1) instead of IIII. However, the only subtractive combinations allowed are: * IV : 4* IX : 9* XL : 40* XC : 90* CD : 400* CM : 900 Note: for larger numbers, a horizontal overline is required to make the number a multiple of 1000. For example, IV with an overline is 4000 and XVI with an overline is 16000.App Features: - Quizzes for converting Roman Numerals to Arabic Numerals, and vice versa.- Powerful Quiz generation engine: all quizzes are auto-generated, providing unlimited possibilities.- Configurable: the numbers can range from 1 to 9999, and the range of numbers is user-configurable and it must consist of at least 50 values.- Performance monitoring for each quiz type.- Built-in Stop Watch to time the user's' problem solving capability.- Universal App - works on iPhone and iPad devices.