4=7 40÷5=8 4×9=36 45-40=5 9+3－【解析】【解答】解：16+20=36 28÷
2=10 14－4+20=30 8元-6元-3角=1元7角故答案为：36；7；8；36；5；10；30；1元7角.
【分析】根据整数加减计算方法解答整数加减题目，再根据乘法口诀解答整数乘除法题目.
2.【答案】（1）解：45+45－34=56
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（2）解：66－30+49=85
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（3）解：16+50－26=40
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【考点】整数的加法和减法
【解析】【分析】整数加减计算方法：把相同数位对齐，再把相同数位上的数相加或相减；相加时，哪一位满十就向前一位进一；相减时，如果不够减就向前一位借1当10，据此计算即可五、
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This article includes some parts, including text, pictures, and design. Copyright is personal owne
1.【答案】解：如图所示：
【考点】简单图形的折叠问题
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【解析】【分析】想象上面一排的图形折叠后的图形，再根据下面一排剪掉后留下边沿的图形即可解答.
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This article includes some parts, including text, pictures, and design. Copyright is personal owne2.【答案】解：如图所示：【考点】直线、线段和射线的认识
【解析】【分析】首先求出比8厘米少3厘米的线段是8-3=5（厘米），再根据直尺画线段的方法画出5厘米的线段即可.
六、
1.【答案】解：从图中可得：2×5=10；5×2=10；10÷2=5；10÷5=2. 【考点】5的乘法口诀
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【解析】【分析】一共有5组，每组有2个，用组数乘每组的个数或用每组的个数乘组数即可列出乘法算式，用总数除以组数即可求出一组的个数或用总数除以一组的个数即可求出组数，据此列出除法算式.
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2.【答案】解：80-15-17= 48（本）答：还剩48本. 【考点】整数连减
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【解析】【分析】用图书箱里书的总数量减去上午、下午借出的数量，列式为：80-15-17，由此计算即可.
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This article includes some parts, including text, pictures, and design. Copyright is personal owne3.【答案】解：2×4=8（根）答：4人需要8根筷子．【考点】4的乘法口诀
This article includes some parts, including text, pictures, and design. Copyright is personal owne
This article includes some parts, including text, pictures, and design. Copyright is personal own【解析】【分析】用一人需要筷子的数量乘吃饭的人数即可解答.
4.【答案】解：20÷5=4答：一本故事书的价钱是一支钢笔的4倍.②10÷5=2
This article includes some parts, including text, pictures, and design. Copyright is personal owneThis article includes some parts, including text, pictures, and design. Copyright is personal own
This article includes some parts, including text, pictures, and design. Copyright is personal own答：一架飞机的价钱是一只钢笔的2倍. 【考点】表内除法
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【解析】【分析】用故事书的价钱除以钢笔的价钱即可求出一本故事书的价钱是一支钢笔的几倍；用一架飞机的价钱除以一只钢笔的价钱即可求出一架飞机的价钱是一只钢笔的几倍.版权申明 本文部分内容，包括文字、图片、以及设计等在网上搜集整理.版权为个人所有 This article includes some parts, including text, pictures, and design. Copyright is personal ownership. 用户可将本文地内容或服务用于个人学习、研究或欣赏，以及其他非商业性或非盈利性用途，但同时应遵守著作权法及其他相关法律地规定，不得侵犯本网站及相关权利人地合法权利.除此以外，将本文任何内容或服务用于其他用途时，须征得本人及相关权利人地书面许可，并支付报酬. Users may use the contents or services of this article for personal study, research or appreciation, and other non-commercial or non-profit purposes, but at the same time, they shall abide by the provisions of copyright law and other relevant laws, and shall not infringe upon the legitimate rights of this website and its relevant obligees. In addition, when any content or service of this article is used for other purposes, written permission and remuneration shall be obtained from the person concerned and the relevant obligee. 转载或引用本文内容必须是以新闻性或资料性公共免费信息为使用目地地合理、善意引用，不得对本文内容原意进行曲解、修改，并自负版权等法律责任.Reproduction or quotation of the content of this article must be reasonable and good-faith citation for the use of news or informative public free information. It shall not misinterpret or modify the original intention of the content of this article, and shall bear legal liability such as copyright.
