NCERT Exemplar Solutions
Class 6 - Mathematics - Unit 1: Number System - Fill in the Blanks

Question 111

Step 1: Break 66 into place values.

We can write 66 as:

\(66 = 60 + 6\)

Step 2: Write 60 in Roman numerals.

We know the basic symbols:

• \(L = 50\)
• \(X = 10\)

So, \(60 = 50 + 10\), which is:

\(60 = L + X = LX\)

Step 3: Write 6 in Roman numerals.

• \(V = 5\)
• \(I = 1\)

So, \(6 = 5 + 1\), which is:

\(6 = V + I = VI\)

Step 4: Combine 60 and 6.

Put \(LX\) (for 60) and \(VI\) (for 6) together:

\(66 = LX + VI = LXVI\)

Note: The letters are in decreasing order (\(L\), then \(X\), then \(V\), then \(I\)), so we add their values.