There are 12 inches in 1 foot. Therefore, 1 ft = 12 inches, 2ft=24 inches 3ft =36inches, and so on. To find how many inches = the amount of feet you would simply multiply the number of feet by 12. For example 4ft would be 4x12=48. Or 5ft would be 5x12=60 Therefore 4ft =48inches. And 5ft =60inches If u are given an amount in inches to determine feet you would divide by 12 For example 84 inches into feet would be solved by dividing 84by 12 84/12=7 you now know that 84inches =7feet