This is a hard coupon question, because it depends on so many factors!
1. What is your store coupon policy? One of my stores limits you to 3 like coupons. The other mains store I shop at limits you to 4 like coupons. Find out your store policy by checking their website or talking to customer service.
2. How many items are you buying? If you have a $1/1 coupon, you must buy one item on the coupon. If you buy 3 items, you should be able to use 3 of those coupons. If your coupon says $1/2, you have to buy 2 items for every coupon you want to use.
3. What does the fine print say? There is a rare coupon that says one per transaction or one per customer. Those coupons should only be used one at a time. P & G coupons now limit you to 4 like coupons per transaction as well.
4. What does your cashier or manager say? No matter how many coupons you can use according to the rules, there will still be an occasional cashier or manager that limits your coupons.
What other factors depend on how many coupons you can use?