Grade 5 Math Quiz: Test Your Math Skills

The Arabic representation for the Roman numeral XX is 20.

Here’s the breakdown:

In Roman numerals, X represents 10.

XX means 10 + 10, which equals 20.

So, XX = 10 + 10 = 20.

The Roman numeral M represents the number 1000 in the Arabic numeral system. The Roman numeral system uses letters from the Latin alphabet to represent values. M is the Roman numeral designated to represent the value 1000. Therefore, M directly translates to the Arabic numeral 1000.

The Arabic representation for the numeral "XI" is 11. In Roman numerals, "X" represents 10 and "I" represents 1. When these two numerals are combined, "XI" represents the number 11.

To complete the series:

L = 50

C = 100

The next Roman numeral in increasing order is D, which represents 500.

M = 1000

So, the completed series is: L, C, D, M.

The Roman representation for 18 is XVIII.

Here’s the breakdown:

X represents 10.

VIII represents 8 (since V is 5 and III is 3, and 5 + 3 = 8).

So, 18 is written as XVIII in Roman numerals.

The Roman numeral for 21 is XXI.

Here’s the breakdown:

X represents 10.

XX represents 20 (since 10 + 10 = 20).

I represents 1.

So, 21 is written as XXI in Roman numerals.

The Roman numeral IV represents the number 4 in the Arabic numeral system.

Here’s the breakdown:

In Roman numerals, I represents 1, and V represents 5.

When a smaller numeral (I) precedes a larger numeral (V), it indicates subtraction.

Thus, IV means 1 subtracted from 5, which equals 4.

So, IV = 5 - 1 = 4.

The odd one out is NXI.

Here's why:

XI (11 in Roman numerals)

V (5 in Roman numerals)

IV (4 in Roman numerals)

NXI is not a valid Roman numeral.

All the others are valid Roman numerals representing specific numbers, whereas NXI does not conform to Roman numeral conventions.

The Arabic representation for the Roman numeral XIV is 14.

Here’s the breakdown:

X represents 10.

IV represents 4 (since I before V indicates subtraction: 5 - 1).

So, XIV = 10 + 4 = 14.

The Roman numeral L represents the number 50 in the Arabic numeral system. The Roman numeral system uses letters to represent certain values. L is the Roman numeral specifically designated to represent the value 50. Therefore, L directly translates to the Arabic numeral 50.

The Roman representation for 110 is CX.

Here’s the breakdown:

C represents 100.

X represents 10.

So, 110 is written as CX in Roman numerals.

The odd one out is llll because it is the only option that does not match the pattern of the other options. The other options are Roman numerals that represent the numbers 1, 2, and 4 respectively, while option llll does not represent any number in Roman numerals.

The odd one out is XXXX.

Here's why:

L is a valid Roman numeral representing 50.

XIV is a valid Roman numeral representing 14.

XVI is a valid Roman numeral representing 16.

XXXX is not a valid Roman numeral. According to Roman numeral conventions, the number 40 should be written as XL, not XXXX.

The odd one out is E.

Here's why:

V, C, and D are all Roman numerals (V = 5, C = 100, D = 500).

E is not a Roman numeral.

The Arabic representation for the Roman numeral XL is 40.

Here’s the breakdown:

X represents 10.

L represents 50.

When a smaller numeral (X) precedes a larger numeral (L), it indicates subtraction.

So, XL means 10 subtracted from 50, which equals 40.

Thus, XL = 50 - 10 = 40.