① 480÷16=30 ② 4×46×25= 4600 ③ 7×99+7= 700 ④ 57×98+57×2=5700 ⑤ 1.2×0.6=0.72 ⑥1/3-1/4=1/12 ⑦0.85 ÷ 0.5=1.7 ⑧3/8 ÷ 6=1/16 ⑨9.2-3.8=5.4 ⑩1700 ÷ 50 ÷ 2=17