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It means subtraction. Example: What is the difference of 9 and 5? 9-5=4 The difference (or answer) is 4!
Difference is a subtraction word. What is the difference between 5 and 2 = 3
The expression "twice the difference of x and 5" would look like this: 2(x-5). To solve the problem, you would first subtract 5 from x, and then multiply the difference by two.
50 what's "mental math" supposed to mean? if it just means you did it in your head, then there is no difference between mental and regular math, except that it is harder to check your work.
its basically minus. e.g. the difference of 5 and 2 is 3. or in other words, 5-2=3