数学二年级(下) 63QD

第2课时 用竖式计算有余数的除法

基础练兵坊

一、括号里最大能填几?

$\backslash square\; \backslash div\; 8\; =\; \backslash square\; \backslash cdots\; \backslash cdots\; (\backslash quad)$ $\backslash square\; \backslash div\; 5\; =\; \backslash square\; \backslash cdots\; \backslash cdots\; (\backslash quad)$

$\backslash square\; \backslash div\; 3\; =\; \backslash square\; \backslash cdots\; \backslash cdots\; (\backslash quad)$ $\backslash square\; \backslash div\; 6\; =\; \backslash square\; \backslash cdots\; \backslash cdots\; (\backslash quad)$

$\backslash square\; \backslash div\; 9\; =\; \backslash square\; \backslash cdots\; \backslash cdots\; (\backslash quad)$ $\backslash square\; \backslash div\; 7\; =\; \backslash square\; \backslash cdots\; \backslash cdots\; (\backslash quad)$

二、想一想,填一填。

48个苹果,平均分给9个同学,每人分几个?

$48\; \backslash div\; 9\; =\; \backslash square\; (\backslash text\{个\})\; \backslash cdots\; \backslash cdots\; \backslash square\; (\backslash text\{个\})$

读作: ________________________________

三、数学诊断。(对的打“√”,错的打“×”,并改正)

$$\backslash begin\{array\}\{r\}\; 4\; \backslash \backslash \; 3\; \backslash overline\{)\; 17\}\; \backslash \backslash \; 12\; \backslash \backslash \; \backslash hline\; 5\; \backslash end\{array\}\; \backslash quad\; \backslash text\{改正:\}\; \backslash quad\; (\backslash quad)$$

$$\backslash begin\{array\}\{r\}\; 5\; \backslash \backslash \; 3\; \backslash overline\{)\; 18\}\; \backslash \backslash \; 15\; \backslash \backslash \; \backslash hline\; 3\; \backslash end\{array\}\; \backslash quad\; \backslash text\{改正:\}\; \backslash quad\; (\backslash quad)$$

四、我是涂色小高手。(把余数是2的涂成红色)

五、竖式计算属我强。

$$9\; \backslash overline\{)\; 74\}$$

$$2\; \backslash overline\{)\; 17\}$$

$$8\; \backslash overline\{)\; 60\}$$

例题讲解。

徐老师去商店买笔,每支3元,他带了20元,可以买几支?还剩几元?

思路分析:这是一道有余数的除法题,可以买的支数就是所得的商,所剩余的钱数就是余数。

自我解答:

温馨提示:在除法竖式中试商的方法和除法横式中试商的方法完全一样,都是去想括号里最大能填几。

计算有余数的除法时,要想哪个数与除数相乘最接近被除数,同时要牢记余数比除数小。

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