Question

Convert the Roman Numeral CCCXL (with two lines above it) to Hindu-Arabic form

Answer 1

Each line above the numbers multiply it by 1000. So this number is being multiplied by 1000000.

Each "C" is equal to 100, since there are "CCC" the number is 300.

"XL" is equal to 40, because "X" is equal to 10 and "L" is equal to 50, but since he X is on the left of the L we subtract them.

The number CCCXL is then 340, but there are the two lines. So we have:

`\bar{\bar{CCCXL}}=340\cdot1000\cdot1000=340,000,000`