Converting hexadecimal, binary and decimal numbers.
You'll learn how to write numbers as Roman numerals as well as write Roman numerals back into standard numerals.
Number Spellings - Large Numbers
Choose the correct written number alternative
Fewest Coins (Red)
Exchanging quarters, dimes, nickels, and pennies for the fewest coins possible at the lowest level of differentiation
加加看 : 添加分数 (Adding Fractions)