分析:①②小數(shù)的加減,首先把小數(shù)點(diǎn)對(duì)齊,數(shù)位也就對(duì)齊了.用減法進(jìn)行驗(yàn)算.③④是小數(shù)除法計(jì)算,商的小數(shù)點(diǎn)與被除數(shù)的小數(shù)點(diǎn)對(duì)齊.除法用乘法進(jìn)行驗(yàn)算.
解答:解:①8+6.5=14.5;
_________
14.5
驗(yàn)算:
_________
8.0
②10-0.9=9.1;
_________
9.1
驗(yàn)算:
___________
10.0
③653÷5=130.6;
130.6
5
___________
15
15
___________
30
30
____________
0
驗(yàn)算:
_______________
653.0
④192÷3=64;
64
18
____________
12
12
_______________
0
驗(yàn)算:
___________
1 9 2
點(diǎn)評(píng):本題考查了學(xué)生的計(jì)算能力,小數(shù)的加減,小數(shù)點(diǎn)要對(duì)齊,小數(shù)的除法,商的小數(shù)點(diǎn)與被除數(shù)的小數(shù)點(diǎn)要對(duì)齊.