According to the rules of Roman numerals, what happens to a symbol if it is repeated?

Its value is added as many times as it occurs.

The symbols V, L, and D are unique in that they can never be ___ of a greater value symbol.

Subtracted

If a symbol of smaller value is placed to the left of a larger symbol, what operation is performed?

The value of the smaller symbol is subtracted from the larger symbol.

If the number 50 is equidistant from 0 and 100, it is rounded off to ___ when estimating.

100

What is the general rule for estimating the product of two numbers?

Round off each factor to its greatest place, then multiply the rounded off factors.

Fill in the blank: 1 kilometre is equal to ___ metres.

1000

True or False: Numbers between 1 and 49 are rounded off to 100 when estimating.

False. They are rounded off to 0.

Riddle: I can be added when repeated, but if I'm smaller and to the left, I subtract. What am I?

A Roman numeral.

What is the estimation rule for numbers between 501 and 999?

They are nearer to 1000 than to 0 and rounded off as 1000.

What happens to numbers between 51 and 99 during estimation?

They are closer to 100 than to 0 and rounded off to 100.

What are the rules for writing Roman numerals with respect to the addition of smaller values to larger values?

If a symbol of smaller value is written to the right of a symbol of greater value, its value gets added to the value of the greater symbol.

Fill in the blank: The symbol 'I' can be subtracted from ___ and ___ only.

V and X

True or False: The symbols V, L, and D can be repeated more than three times in Roman numerals.

False. The symbols V, L, and D are never repeated.

What is the estimation rule for numbers between 1 and 49?

Numbers 1 to 49 are closer to 0 than to 100 and are rounded off to 0.

Riddle: I am a number that can be both added and subtracted, but I can never be repeated. What number am I?

I can be V, L, or D in Roman numerals.

How do you round off numbers between 501 and 999?

Numbers 501 to 999 are nearer to 1000 than to 0 and are rounded off as 1000.

Fill in the blank: 1 kilometre is equal to ___ metres.

1000

What happens to the value of a Roman numeral when a smaller symbol is placed before a larger one?

Its value is subtracted from the value of the larger symbol.

What is the conversion relationship between metres and centimetres?

1 metre = 100 centimetres.

Explain the estimation procedure when performing multiplication.

Round off each factor to its greatest place, then multiply the rounded off factors.