40 in Roman Numerals

40 in Roman numerals is XL. One may get confused that 40 in Roman numerals is XXXX, but this is incorrect. Now the question is, why? To understand why we write 40 as XL in roman numerals, one should know the basic rules to convert the natural numbers to roman numerals, and vice versa. So, let’s have a look at the chart given below to know the equivalent roman numerals for some important numbers.

Natural numbers

1

5

10

50

100

500

1000

Corresponding Roman numerals

I

V

X

L

C

D

M

Learn: Roman numerals

Conversion of 40 to Roman Numerals

The value of 40 in roman numerals is XL. The below figure shows the conversion of 40 to roman numerals.

40 in Roman numerals

Also, try: Roman numerals Converter

How to Write Numbers in Roman Numerals?

Consider the following sequence of roman numerals:

I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII, XIII, XIV, XV, XVI, XVII, XVIII, XIX, XX

From this, we can write the following basic rules for the conversion of roman numerals to numerical values.

  • When a bigger letter precedes a smaller letter, we should subtract the corresponding numerical values. For example, the value of XL can be derived as L – X = 50 – 10 = 40, where L is the bigger number.
  • Also, the notation XL can be read as “ten less than fifty, i.e. 40”.
  • When a bigger letter succeeds a smaller letter, we should add the corresponding numerical values. Consider LX, where X is the bigger number. So, LX = L + X = 50 + 10 = 60. Also, the notation LX can be read as “ten more than fifty, i.e. 60”.

Video Lesson on Roman Numerals

1-40 in Roman Numerals

The below table shows the equivalent roman numerals for the numbers from 1 to 40.

1 to 20 in Roman Numerals

21 to 40 in Roman Numerals

Number

Expansion

Roman Numeral

Number

Roman Numeral

1

1

I

21

10 + 10 + 1

XXI

2

1 + 1

II

22

10 + 10 + 1 + 1

XXII

3

1 + 1 + 1

III

23

10 + 10 + 1 + 1 + 1

XXIII

4

5 – 1

IV

24

10 + 10 – 1 + 5

XXIV

5

5

V

25

10 + 10 + 5

XXV

6

5 + 1

VI

26

10 + 10 + 5 + 1

XXVI

7

5 + 1 + 1

VII

27

10 + 10 + 5 + 1 + 1

XXVII

8

5 + 1 + 1 + 1

VIII

28

10 + 10 + 5 + 1 + 1 + 1

XXVIII

9

10 – 1

IX

29

10 + 10 – 1 + 10

XXIX

10

10

X

30

10 + 10 + 10

XXX

11

10 + 1

XI

31

10 + 10 + 10 + 1

XXXI

12

10 + 1 + 1

XII

32

10 + 10 + 10 + 1 + 1

XXXII

13

10 + 1 + 1 + 1

XIII

33

10 + 10 + 10 + 1 + 1 + 1

XXXIII

14

10 – 1 + 5

XIV

34

10 + 10 + 10 – 1 + 5

XXXIV

15

10 + 5

XV

35

10 + 10 + 10 + 5

XXXV

16

10 + 5 + 1

XVI

36

10 + 10 + 10 + 5 + 1

XXXVI

17

10 + 5 + 1 + 1

XVII

37

10 + 10 + 10 + 5 + 1 + 1

XXXVII

18

10 + 5 + 1 + 1 + 1

XVIII

38

10 + 10 + 10 + 5 + 1 + 1 + 1

XXXVIII

19

10 – 1 + 10

XIX

39

10 + 10 + 10 – 1 + 10

XXXIV

20

10 + 10

XX

40

50 – 10

XL

Get the conversion of some specific numbers to Roman Numerals:

30 in Roman numerals = 10 + 10 + 10 = X + X + X = XXX

41 in Roman numerals = 50 – 10 + 1 = L – X + I = XLI

44 in Roman numerals = 50 – 10 – 1 + 5 = L – X – I + V = XLIV

45 in Roman numerals = 50 – 10 + 5 = L – X + V = XLV

49 in Roman numerals = 50 – 10 – 1 + 10 = L – X – I + 10 = XLIX

50 in Roman numerals = L

60 in Roman numerals = 50 +10 = L + X = LX

90 in Roman numerals = 100 – 10 = C – X = XC

500 in Roman numerals = D

1000 in Roman numerals = M

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