1 直接写出得数。
$3.2 - 1.2 =$
$0.85 - 0.45 =$
$2 - 0.4 =$
$0.48 × 0.7 =$
$7.2 × 5 =$
$6.9 + 3.1 =$
$3.8 × 100 =$
$2.08 × 4 =$
$5.94 ÷ 1000 =$
$0.25 × 4 =$
$3.15 - 0.15 =$
$5 + 1.6 =$

$3.2 - 1.2 = 2$
$0.85 - 0.45 = 0.4$
$2 - 0.4 = 1.6$
$0.48 × 0.7 = 0.336$
$7.2 × 5 = 36$
$6.9 + 3.1 = 10$
$3.8 × 100 = 380$
$2.08 × 4 = 8.32$
$5.94 ÷ 1000 = 0.00594$
$0.25 × 4 = 1$
$3.15 - 0.15 = 3$
$5 + 1.6 = 6.6$

2 脱式计算。
$10-(3.56+2.73)$
$29.1-5.7+6.8$
$10.35+(6.32-4.15)$
$1.872+11.35+8.65$

$10-(3.56+2.73)=3.71$
$29.1-5.7+6.8=30.2$
$10.35+（6.32-4.15）$
$=10.35+2.17$
$=12.52$
$1.872+11.35+8.65$
$=1.872+（11.35+8.65）$
$= 21.872$

3 在$◯$里填上“＞”“＜”或“=”。
$1×0.09◯0.9$
$0.83×7◯7$
$0.6×0.6◯0.6$
$0.73×0.83◯0.73$
$0×101◯45$
$3.99×1.001◯3.99$
$1.8×1.7◯1.8$
$1.6×1◯1.6$
$3.68×0.1◯0.368$
$4.78÷10◯0.478$

$1×0.09 ＜ 0.9$
$0.83×7 ＜ 7$
$0.6×0.6 ＜ 0.6$
$0.73×0.83 ＜ 0.73$
$0×101 ＜ 45$
$3.99×1.001 ＞ 3.99$
$1.8×1.7 ＞ 1.8$
$1.6×1 = 1.6$
$3.68×0.1 = 0.368$
$4.78÷10 = 0.478$