一、口算。
$91 - 55 =$         $7×2 =$         $54÷8 =$
$6×3 =$         $64 - 46 =$         $44÷7 =$
$29 + 42 =$         $5×9 =$         $17÷5 =$
$2×3 =$         $27 + 25 =$         $30÷6 =$
$63 - 37 =$         $7×3 =$         $13÷6 =$
$4×9 =$         $55 + 18 =$         $14÷2 =$
$5×3 =$         $63 - 45 =$         $50÷7 =$
$26 + 66 =$         $6×4 =$         $32÷4 =$
$4×4 =$         $70 - 41 =$         $24÷3 =$
$85 - 58 =$         $2×9 =$         $38÷5 =$

$91 - 55 = 36$，$7×2 = 14$，$54÷8 = 6······6$
$6×3 = 18$，$64 - 46 = 18$，$44÷7 = 6······2$
$29 + 42 = 71$，$5×9 = 45$，$17÷5 = 3······2$
$2×3 = 6$，$27 + 25 = 52$，$30÷6 = 5$
$63 - 37 = 26$，$7×3 = 21$，$13÷6 = 2······1$
$4×9 = 36$，$55 + 18 = 73$，$14÷2 = 7$
$5×3 = 15$，$63 - 45 = 18$，$50÷7 = 7······1$
$26 + 66 = 92$，$6×4 = 24$，$32÷4 = 8$
$4×4 = 16$，$70 - 41 = 29$，$24÷3 = 8$
$85 - 58 = 27$，$2×9 = 18$，$38÷5 = 7······3$

二、用“$◯$”画一画，填一填。
1. AAA
B 的个数是 A 的 2 倍，B 有多少个？
$□ ◯ □ = □$
2.
的个数是 的 4 倍，有多少个？
$□ ◯ □ = □$

3×2=6
2×4=8