40 bazillion of each should do the trick! LOL
Actually, based on Jennifer's (Hopeful Homemaker) calculations and depending on how you make your HST's you would need approximately:
BACKGROUND: 192 3 1/2" squares and 42 3 7/8 squares for HST's. Personally, I use 21 4" squares and make 2 HST's at a time but please do whatever method works for you! ((or 8 FQ's))
PRIMARY: 132 3 1/2" squares and 36 – 3 7/8 inch squares for the HST's (or 18 4" squares). ((or 7 FQ's))
SECONDARY: 168 3 1/2" squares and 30 3 7/8" squares (or 15 4" squares) for the HST's. ((or 8 FQ's))
Hope that helps - - -