Erica bought three twelve yards of fabric, which means she has a total of:
- 3 x 12 = 36 yards of fabric
If she uses 23 yards of that fabric to make a curtain, we can find out how much she has left by subtracting the amount used from the total she had:
- 36 – 23 = 13 yards
So, after making the curtain, Erica will have 13 yards of fabric left.