CONVERTING NUMERALS

Convert between Roman numerals and regular numbers.

L3L4

Section 1 / 2

ROMAN TO ARABIC (OUR NUMBERS)

To convert Roman numerals to regular numbers: read left to right. If a smaller value comes before a larger one, subtract it; otherwise add it. XLII: X before L means 50−10=40, then add II=2. Total: 42.

XLII = ?

1XL = 40 (50 − 10)

2II = 2

340 + 2 = 42

= 42

LXVI = ?

1L = 50

2X = 10

3VI = 6

450 + 10 + 6 = 66

= 66

LEADER TIP

Practice reading years on building cornerstones and movie credits. Make it a real-world treasure hunt.

BEFORE THIS LESSON, TRY

Roman Numerals Basics

PRACTICE WITH THESE GAMES

Sort Numbers

Quick Calculate

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Subtractive Notation

CONVERTING NUMERALS

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CONVERTING NUMERALS