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Roman Numerals (1)

Roman numerals are written in the following way.

1 2 3 4 5 6 7 8 9 10 50 100 500 1,000
1. Write the Roman numerals as modern numbers.

a.

2=1+1=
3=1+1+1=
b. 4 = 5 1 =
6=5+1=
9 = 10 1 =
11 = 10 + 1 =
40 = 50 10 =
c. 90 = 100 10 =
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