Need Help Understanding Blog Post Statement

Hello everyone.

I was reading todays blogpost (https://blog.myfitnesspal.com/how-to-lose-an-extra-half-pound-a-week/) and was curious about the math of weight loss as presented in the article.

The following statement was made in the body of the article: "One hundred extra calories burned each day is about a half-pound per week..."

Wouldn't that be about a quarter-pound per week? The number I've always had in my head for the conversion is 1 pound = 3,500 calories (insomuch as that kind of conversion is useful). So wouldn't cutting 100 calories per day basically be about a pound per month?

I'm assuming there is something here I'm either misunderstanding, don't know about, or perhaps the trainer was figuring in some other factors (such as the exercise itself). Just looking for clarification so I can be sure my current knowledge/understanding isn't in error as it would change how I plan my own diet and routine.

Thanks!