1)6×3=18 6×9=54 7×6=42 4×6=24 6×8=48
6×4+5×4=44 9×6-6×6=18 7×6+8×6=90 5×6+3×6=12 8×6-6×6=12 30-6×5=0 36+9×6=90 100-6×8=52 6×4+36=60 7×6-40=2
