170 in Roman Numerals

Royal titles, such as Henry I and Henry II, often use Roman numerals. Have you noticed these symbols and wondered what they represent? These are Roman numerals.

In ancient times, people used fingers, sticks, and bones to count. As life became more complex, a standard form of counting was needed. The ancient Romans developed the Roman numeral system to meet this need. In this system, I (1), V (5), X (10), L (50), C (100), D (500), and M (1000) are the symbols used for counting.

In Roman numerals, we use CLXX to represent 170, where C is 100, L is 50, and XX is 20. Let’s learn more about Roman numerals and how we write them.

There are certain basic rules to write numbers in Roman numerals. Let's discuss some essential rules that need to be remembered when writing a number in Roman numerals.

Rule 1: Addition Method

The addition method is used when a smaller number is placed after a larger number. For example, CLXX → C + L + X + X → 100 + 50 + 10 + 10 = 170

Rule 2: Repetition Method

To write large numbers, certain Roman numerals can be repeated up to three times. For example, XX → 20.

Rule 3: Subtraction Method

If a smaller number precedes a larger number in Roman numerals, we subtract the smaller number from the larger one. For example, XL → L - X → 50 - 10 = 40

Rule 4: Limitation Rule

Symbols cannot be repeated more than three times, and some symbols like V, L, and D cannot be repeated. For example, we won't write LL for 100; instead, we use C, and for 80, we write LXXX, not LXXXXXXXX.

Let’s now learn how to write 170 in Roman numerals. Follow these methods to write the number in Roman numerals.

• By Expansion Method
• By Grouping Method

In the expansion method, the number is broken down based on place value. In this section, we will learn how to write 170 in Roman numerals using the expansion method.

To write 170 in Roman numerals, follow these steps:

Step 1: Break the number based on place value into hundreds, tens, and units. 

For 170, we write it as 100 + 50 + 10 + 10

Step 2: Convert the numbers into Roman numerals:

  100 in Roman numerals — C
  50 in Roman numerals — L
  10 in Roman numerals — X

Step 3: Combine the Roman numerals:

Therefore, 170 in Roman numerals is C (100) + L (50) + X (10) + X (10) = CLXX

When writing a large number in Roman numerals, we group the number. To write 170 in Roman numerals, we group 170 as 100 + 50 + 10 + 10:

  100 in Roman numerals — C
  50 in Roman numerals — L
  10 in Roman numerals — X

So, 170 is written as CLXX in Roman numerals.

Roman numerals follow a certain pattern, making them look similar. In this section, we will learn some numbers related to the Roman numeral 170:

• Addition Rule: The addition method is used when a larger numeral is followed by a smaller numeral, where their values are added. For example, CLXX = C + L + X + X = 100 + 50 + 10 + 10 = 170.

• Grouping Method: The given numbers are grouped based on their place value and then converted into Roman numerals. For example, 170 = 100 + 50 + 10 + 10 = CLXX.

• Repetition Rule: Certain symbols (I, X, C, M) in the Roman numeral system can be repeated only up to three times. For example, XX = 20 (X is repeated two times to represent the number 20).

• Subtraction Method: Used when a smaller numeral precedes a larger one, subtracting the former from the latter. For example, XL = 50 - 10 = 40.

• Limitation Rule: Symbols cannot be repeated more than three times, and symbols like V, L, and D cannot be repeated. For example, we use LV for 55, not LLLV.