To calculate 10% off, simply move the decimal point one place to the left to find the discount amount, then subtract it from the original price. For example, 10% of $100 is $10, so the sale price is $90. This is the easiest percentage discount to calculate mentally.

A 10% discount can add up to meaningful savings, especially on higher-priced items. On a $100 purchase you save $10, but on a $1,000 item you save $100. Whether it's worth it depends on the item and whether you'd buy it at full price anyway.

Stacking discounts depends on the retailer's policy. Some stores allow you to combine a 10% coupon with a sale price, while others restrict one discount per purchase. Always check the terms and conditions, and note that stacked discounts are applied sequentially, not added together.