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扬帆起航
$0.36-0.32=$
$2.6-2.2=$
$8.76-5.43=$
$9.87-5.3=$
$0.36-0.32=$
0.04
$0.76-0.62=$0.14
$1.42-1.32=$0.1
$2.6-2.2=$
0.4
$5.87-5.77=$0.1
$4.98-3.32=$1.66
$8.76-5.43=$
3.33
$4.98-3.3=$1.68
$7.67-2.3=$5.37
$9.87-5.3=$
4.57
$10.66-5.66=$5
$0.66-0.35=$0.31
答案
1. $0.36 - 0.32 = 0.04$
2. $0.76 - 0.62 = 0.14$
3. $1.42 - 1.32 = 0.10（即0.1）$
4. $2.6 - 2.2 = 0.4$
5. $5.87 - 5.77 = 0.10（即0.1）$
6. $4.98 - 3.32 = 1.66$
7. $8.76 - 5.43 = 3.33$
8. $4.98 - 3.3 = 1.68$
9. $7.67 - 2.3 = 5.37$
10. $9.87 - 5.3 = 4.57$
11. $10.66 - 5.66 = 5.00（即5）$
12. $0.66 - 0.35 = 0.31$
2. $0.76 - 0.62 = 0.14$
3. $1.42 - 1.32 = 0.10（即0.1）$
4. $2.6 - 2.2 = 0.4$
5. $5.87 - 5.77 = 0.10（即0.1）$
6. $4.98 - 3.32 = 1.66$
7. $8.76 - 5.43 = 3.33$
8. $4.98 - 3.3 = 1.68$
9. $7.67 - 2.3 = 5.37$
10. $9.87 - 5.3 = 4.57$
11. $10.66 - 5.66 = 5.00（即5）$
12. $0.66 - 0.35 = 0.31$
乘风破浪
$0.36+0.32=$
$6.77+0.12=$
$5.14+0.25=$
$5.36+0.13=$
$34.32+5.02=$
$0.76+1.11=$
$8.92-0.91=$
$5.54+5.45=$
$0.36+0.32=$
0.68
$2.36+0.32=$2.68
$1.32+0.45=$1.77
$6.77+0.12=$
6.89
$9.22+0.77=$9.99
$4.18+0.21=$4.39
$5.14+0.25=$
5.39
$10.36+0.4=$10.76
$9.7+0.24=$9.94
$5.36+0.13=$
5.49
$7.14+0.26=$7.4
$25.22+1.3=$26.52
$34.32+5.02=$
39.34
$10.3+0.43=$10.73
$20.15+0.32=$20.47
$0.76+1.11=$
1.87
$12.55+0.44=$12.99
$0.34+0.3=$0.64
$8.92-0.91=$
8.01
$36+0.32=$36.32
$21+21.32=$42.32
$5.54+5.45=$
10.99
$34.31+0.38=$34.69
$89.6-87.3=$2.3
答案
1.$0.36 + 0.32 = 0.68$
2.$2.36 + 0.32 = 2.68$
3.$1.32 + 0.45 = 1.77$
4.$6.77 + 0.12 = 6.89$
5.$9.22 + 0.77 = 9.99$
6.$4.18 + 0.21 = 4.39$
7.$5.14 + 0.25 = 5.39$
8.$10.36 + 0.4 = 10.76$
9.$9.7 + 0.24 = 9.94$
10.$5.36 + 0.13 = 5.49$
11.$7.14 + 0.26 = 7.4$
12.$25.22 + 1.3 = 26.52$
13.$34.32 + 5.02 = 39.34$
14.$10.3 + 0.43 = 10.73$
15.$20.15 + 0.32 = 20.47$
16.$0.76 + 1.11 = 1.87$
17.$12.55 + 0.44 = 12.99$
18.$0.34 + 0.3 = 0.64$
19.$8.92 - 0.91 = 8.01$
20.$36 + 0.32 = 36.32$
21.$21 + 21.32 = 42.32$
22.$5.54 + 5.45 = 10.99$
23.$34.31 + 0.38 = 34.69$
24.$89.6 - 87.3 = 2.3$
2.$2.36 + 0.32 = 2.68$
3.$1.32 + 0.45 = 1.77$
4.$6.77 + 0.12 = 6.89$
5.$9.22 + 0.77 = 9.99$
6.$4.18 + 0.21 = 4.39$
7.$5.14 + 0.25 = 5.39$
8.$10.36 + 0.4 = 10.76$
9.$9.7 + 0.24 = 9.94$
10.$5.36 + 0.13 = 5.49$
11.$7.14 + 0.26 = 7.4$
12.$25.22 + 1.3 = 26.52$
13.$34.32 + 5.02 = 39.34$
14.$10.3 + 0.43 = 10.73$
15.$20.15 + 0.32 = 20.47$
16.$0.76 + 1.11 = 1.87$
17.$12.55 + 0.44 = 12.99$
18.$0.34 + 0.3 = 0.64$
19.$8.92 - 0.91 = 8.01$
20.$36 + 0.32 = 36.32$
21.$21 + 21.32 = 42.32$
22.$5.54 + 5.45 = 10.99$
23.$34.31 + 0.38 = 34.69$
24.$89.6 - 87.3 = 2.3$
圆满返航
用合适的方法进行计算。
$12.3+12.4+12.6+12.7$ $12.3 + 12.4 + 12.6 + 12.7$
$=(12.3 + 12.7)+(12.4 + 12.6)$
$=25 + 25$
$= 50$ $9.25+12.57-4.25+0.43$ $9.25 + 12.57 - 4.25 + 0.43$
$=(9.25 - 4.25)+(12.57 + 0.43)$
$=5 + 13$
$= 18$
秘籍点拨 利用加法交换律，进行“凑整”。
用合适的方法进行计算。
$12.3+12.4+12.6+12.7$ $12.3 + 12.4 + 12.6 + 12.7$
$=(12.3 + 12.7)+(12.4 + 12.6)$
$=25 + 25$
$= 50$ $9.25+12.57-4.25+0.43$ $9.25 + 12.57 - 4.25 + 0.43$
$=(9.25 - 4.25)+(12.57 + 0.43)$
$=5 + 13$
$= 18$
秘籍点拨 利用加法交换律，进行“凑整”。
答案
答题卡作答：
1.
$12.3 + 12.4 + 12.6 + 12.7$
$=(12.3 + 12.7)+(12.4 + 12.6)$
$=25 + 25$
$= 50$
2.
$9.25 + 12.57 - 4.25 + 0.43$
$=(9.25 - 4.25)+(12.57 + 0.43)$
$=5 + 13$
$= 18$
1.
$12.3 + 12.4 + 12.6 + 12.7$
$=(12.3 + 12.7)+(12.4 + 12.6)$
$=25 + 25$
$= 50$
2.
$9.25 + 12.57 - 4.25 + 0.43$
$=(9.25 - 4.25)+(12.57 + 0.43)$
$=5 + 13$
$= 18$
