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:
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.
- 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?
- 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.
- 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
- 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.