Which are not correct?

(b) XLIX + XXXIX =
(d) LIV × VI =
(f) LXIX × VII =

(c) IXC
(f) ICC
(i) XCV

Let's analyze each part of the question to see which Roman numeral equations are not correct.

(b) XLIX + XXXIX

XLIX is 49 and XXXIX is 39.
Adding these gives us 49 + 39 = 88, which in Roman numerals is LXXXVIII.


(d) LIV × VI

LIV is 54 and VI is 6.
Multiplying these gives us 54 × 6 = 324, which in Roman numerals is CCCXXIV.


(f) LXIX × VII

LXIX is 69 and VII is 7.
Multiplying these gives us 69 × 7 = 483, which in Roman numerals is CCCCXXXIII.


(c) IXC

Roman numerals typically follow specific conventions. IXC does not conform to them, as it tries to place a smaller numeral (IX, 9) before a larger one (C, 100) irregularly. It's not a proper representation.


(f) ICC

Similarly, ICC is not a valid Roman numeral representation. Correct Roman numeral rules do not stack smaller numerals before larger unless those smaller numerals are specific (like IV for 4).


(i) XCV

XCV is the correct representation of 95 in Roman numerals.



From this analysis:

Part (c) IXC and (f) ICC are not correct as they do not correctly adhere to Roman numeral conventions.

For error detection, focus on incorrect placement of numerals (like IXC or ICC) that don't follow subtraction rules between specific numeral pairs.

Answered by ElijahBenjaminCarter | 2025-07-06