400
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A multiple of a number is in that number's times table. For example, a multiple of 10 will be in the 10 times table. 30 = 10x3 40 = 10x4 Therefore, 30 and 40 are multiples of 10
40
400
40. (X=10, L=50. A 1 or 10-multiple letter placed BEFORE a larger number subtracts from it. This applies only to the next two larger numbers, a 5-value and a 10-value.) XL = 40, L = 50, XC = 90, C =100 (but not IC, VC, or LC)40. When a larger number is preceded by a smaller, the smaller is subtracted from the larger. Since L, which is 50, is preceded by X, which is 10, the answer is 50-10=40.
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