《连加、连减和加减混合》习题4.doc

<p><span id="_baidu_bookmark_start_0" style="display: none; line-height: 0px;">‍</span>《连加、连减和加减混合》习题
1.口算。
26+20+4＝ &nbsp; &nbsp; &nbsp; 68-8+9＝ &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;76-8-20＝
65+5-70＝ &nbsp; &nbsp; &nbsp; &nbsp;90-2-80＝ &nbsp; &nbsp; &nbsp; &nbsp; 27+15+46＝
90－11-53＝ &nbsp; &nbsp; &nbsp;42＋8＋33＝ &nbsp; &nbsp; &nbsp; 47-38＋65＝
2．计算。
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
28元 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 42元 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;18元
（1）先估计一下，买这三样菜最少要带几张十元？
你是怎样估算的？估计大约（ &nbsp;）元 ，最少（ &nbsp;）张十元。
（2）再计算一下，买这三样菜一共要多少钱？</p>