扬帆起航
$125 × 8 ÷ 10 =$ $25 × 4 ÷ 100 =$ $3600 ÷ 90 + 9 =$
$1500 ÷ 50 + 12 =$ $(315 - 300) ÷ 3 =$ $80 × (6 - 3) =$
$6 × 800 + 4 =$ $8 × 2 + 80 ÷ 4 =$ $30 + 360 ÷ 60 =$
$350 ÷ 70 + 70 =$ $3600 ÷ 360 =$ $106 × 50 =$

1. $125×8÷10$
$=1000÷10$
$=100$
2. $25×4÷100$
$=100÷100$
$=1$
3. $3600÷90 + 9$
$=40 + 9$
$=49$
4. $1500÷50 + 12$
$=30 + 12$
$=42$
5. $(315 - 300)÷3$
$=15÷3$
$=5$
6. $80×(6 - 3)$
$=80×3$
$=240$
7. $6×800 + 4$
$=4800 + 4$
$=4804$
8. $8×2 + 80÷4$
$=16 + 20$
$=36$
9. $30 + 360÷60$
$=30 + 6$
$=36$
10. $350÷70 + 70$
$=5 + 70$
$=75$
11. $3600÷360$
$=10$
12. $106×50$
$=5300$

乘风破浪
$990 ÷ 9 + 86 =$ $16 × 6 + 81 =$ $27 × 9 ÷ 3 =$
$729 ÷ 9 + 91 =$ $12 × 6 + 36 =$ $16 × 4 × 30 =$
$47 + 30 × 9 =$ $35 ÷ (5 × 7) =$ $810 ÷ 90 ÷ 3 =$
$195 - 11 × 13 =$ $200 × 4 ÷ 10 =$ $8 × 19 - 88 =$
$250 - 270 ÷ 9 =$ $111 + 111 × 2 =$ $120 × 5 ÷ 4 =$
$91 + 25 - 37 =$ $16 × 11 - 16 =$ $98 + 91 ÷ 13 =$
$288 ÷ 8 ÷ 9 =$ $17 + 32 ÷ 8 =$ $(41 - 5) ÷ 6 =$

1. $990 ÷ 9 + 86$
$=110 + 86$
= 196
2. $16 × 6 + 81$
$= 96 + 81$
= 177
3. $27 × 9 ÷ 3$
$= 243 ÷ 3$
= 81
4. $729 ÷ 9 + 91$
$= 81 + 91$
= 172
5. $12 × 6 + 36$
$= 72 + 36$
= 108
6. $16 × 4 × 30$
$= 64 × 30$
= 1920
7. $47 + 30 × 9$
$= 47 + 270$
= 317
8. $35 ÷ (5 × 7)$
$= 35 ÷ 35$
= 1
9. $810 ÷ 90 ÷ 3$
$= 9 ÷ 3$
= 3
10. $195 - 11 × 13$
$= 195 - 143$
= 52
11. $200 × 4 ÷ 10$
$= 800 ÷ 10$
= 80
12. $8 × 19 - 88$
$= 152 - 88$
= 64
13. $250 - 270 ÷ 9$
$= 250 - 30$
= 220
14. $111 + 111 × 2$
$= 111 + 222$
= 333
15. $120 × 5 ÷ 4$
$= 600 ÷ 4$
= 150
16. $91 + 25 - 37$
$= 116 - 37$
= 79
17. $16 × 11 - 16$
$= 176 - 16$
= 160
18. $98 + 91 ÷ 13$
$= 98 + 7$
= 105
19. $288 ÷ 8 ÷ 9$
$= 36 ÷ 9$
= 4
20. $17 + 32 ÷ 8$
$= 17 + 4$
= 21
21. $(41 - 5) ÷ 6$
$= 36 ÷ 6$
= 6

圆满返航
用合适的方法计算。
$9.99 × 111 + 3.33 × 667$
秘籍点拨 乘法分配律里的相同乘数“躲”起来了，我们可以利用各个乘数之间的倍数关系找出相同乘数。
第88片

$9.99×111 + 3.33×667$
$=3.33×3×111 + 3.33×667$
$=3.33×333 + 3.33×667$
$=3.33×(333 + 667)$
$=3.33×1000$
$=3330$