Get familiar with Roman numerals

### 1.1. Knowledge to remember

**The clock shows 9 o’clock**

1) The numbers on the side dials are indicated with some of the following commonly used Roman numerals:

2) With the above Roman numerals, we have a few numbers as follows:

I | II | III | IV | DRAW | BECAUSE | VII | VIII | IX | X | XI | XII | XX | XXI |

first | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | ten | 11 | twelfth | 20 | 21 |

### 1.2. Solving Textbook Exercises

**Lesson 1:** Read the following numbers in Roman numerals

I; III; V; VII; IX; XI; XXI

II; IV; BECAUSE; VIII; X; XII; XX.

__Solution guide:__

- Remember how to read commonly used Roman numerals are:

I: one V: five X: ten

- Match the digits I; V; X with arbitrary position to form any roman number.

Read the numbers as follows:

One, three, five, seven, nine, eleven, twenty-one

Two, four, six, eight, ten, twelve, twenty.

**Lesson 2:** What time is the clock?

__Solution guide:__

- Determine what number the hour and minute hands are pointing to and then read the hours respectively.

The clock in figure A has an hour hand that points to 6; The minute hand points to 12, so the clock is showing 6 o’clock.

The clock in picture B has hour and minute hands pointing at 12, so the clock is showing 12 o’clock.

The clock in figure C has the hour hand pointing to 3; The minute hand points to 12, so the clock shows 3 o’clock.

**lesson 3**: Write down the numbers II, VI, V, VII, IV, IX, XI

a) In order from smallest to largest;

b) In order from largest to smallest.

__Solution guide:__

- Determine the values of the numbers and then compare and arrange them in order.

The given roman numbers have values respectively: 2; 6; 5; 7; 4; 9; 11.

We have: 2 < 4 < 5 < 6 < 7 < 9 < 11.

a) The given numbers are written in order from smallest to largest as follows:

II, IV, V, VI, VII, IX, XI.

b) The given numbers are written in order from largest to smallest as follows:

XI, IX, VII, VI, V, IV, II.

Lesson 4: Write numbers from 1 to 12 in Roman numerals

__Solution guide:__

- Use the digits I; V; X and write in the appropriate place to form numbers in the range 12.

The Roman numerals 1 through 12 are: I, II, III, IV, V, VI, VII, VIII, IX, X, XI, XII.

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