Useful how-to articles for measuring square footage, calculating date differences, and everyday practical arithmetic.
To find someone's exact age between two dates, count whole completed years first, then whole completed months since the last birthday, then the remaining days. This calendar-based method gives an exact result, unlike dividing the total number of days elapsed by 365, which is only an approximation.
Square footage is calculated by multiplying a space's length by its width, both measured in feet. For multiple rooms, calculate each rectangular area separately and add them together. For irregular (non-rectangular) rooms, divide the space into smaller rectangles, find each rectangle's area, and sum them.