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$\left.\begin{array}{r}38 \\ 46 \\ 240\end{array}\right\} ×50= $
$\left.\begin{array}{r}26 \\ 37 \\ 36\end{array}\right\} ×300= $
$\left.\begin{array}{r}62 \\ 77 \\ 520 \\ 38\end{array}\right\} ×20= $
$\left.\begin{array}{r}52 \\ 470 \\ 18 \\ 21\end{array}\right\} ×40= $
1900
2300
12000
$\left.\begin{array}{r}26 \\ 37 \\ 36\end{array}\right\} ×300= $
7800
11100
10800
$\left.\begin{array}{r}62 \\ 77 \\ 520 \\ 38\end{array}\right\} ×20= $
1240
1540
10400
760
$\left.\begin{array}{r}52 \\ 470 \\ 18 \\ 21\end{array}\right\} ×40= $
2080
18800
720
840
答案：
解析：本题主要考查多位数与整十、整百数相乘的口算方法，可将整十、整百数看作几个十或几个百，先计算非零数字的乘积，再在结果后面添上相应个数的$0$。
答案：
$\begin{array}{r r r}38 \\ 46 \\ 240 \end{array}\left\}\begin{array}{r} ×50=\\ \\ \end{array} \begin{array}{r r r}1900 \\ 2300 \\ 12000 \end{array}$
$\begin{array}{r r r}26 \\ 37 \\ 36 \end{array}\left\}\begin{array}{r} ×300=\\ \\ \end{array} \begin{array}{r r r}7800 \\ 11100 \\ 10800 \end{array}$
$\begin{array}{r r r}62 \\ 77 \\ 520 \\ 38 \end{array}\left\}\begin{array}{r} ×20=\\ \\ \\ \end{array} \begin{array}{r r r}1240 \\ 1540 \\ 10400 \\ 760 \end{array}$
$\begin{array}{r r r}52 \\ 470 \\ 18 \\ 21 \end{array}\left\}\begin{array}{r} ×40=\\ \\ \\ \end{array} \begin{array}{r r r}2080 \\ 18800 \\ 720 \\ 840 \end{array}$
答案：
$\begin{array}{r r r}38 \\ 46 \\ 240 \end{array}\left\}\begin{array}{r} ×50=\\ \\ \end{array} \begin{array}{r r r}1900 \\ 2300 \\ 12000 \end{array}$
$\begin{array}{r r r}26 \\ 37 \\ 36 \end{array}\left\}\begin{array}{r} ×300=\\ \\ \end{array} \begin{array}{r r r}7800 \\ 11100 \\ 10800 \end{array}$
$\begin{array}{r r r}62 \\ 77 \\ 520 \\ 38 \end{array}\left\}\begin{array}{r} ×20=\\ \\ \\ \end{array} \begin{array}{r r r}1240 \\ 1540 \\ 10400 \\ 760 \end{array}$
$\begin{array}{r r r}52 \\ 470 \\ 18 \\ 21 \end{array}\left\}\begin{array}{r} ×40=\\ \\ \\ \end{array} \begin{array}{r r r}2080 \\ 18800 \\ 720 \\ 840 \end{array}$
$4×4+5=$
$5×9+2=$
$2×9+6=$
$7×8+6=$
$6×9+6=$
$7×5+5=$
$6×3+8=$
$3×6+3=$
$6×4+3=$
$5×7+7=$
$7×2+5=$
$3×5+6=$
$5×9+5=$
$4×2+3=$
$4×9+6=$
$6×8+8=$
$4×4+5=$
$5×3+4=$
$3×6+5=$
$8×8+7=$
$7×8+5=$
$4×6+7=$
$6×8+2=$
$8×6+3=$
$7×3+4=$
$3×3+4=$
$3×9+7=$
19
$5×9+2=$
47
$2×9+6=$
24
$7×8+6=$
62
$6×9+6=$
60
$7×5+5=$
40
$6×3+8=$
26
$3×6+3=$
21
$6×4+3=$
27
$5×7+7=$
42
$7×2+5=$
19
$3×5+6=$
21
$5×9+5=$
50
$4×2+3=$
11
$4×9+6=$
42
$6×8+8=$
56
$4×4+5=$
19
$5×3+4=$
19
$3×6+5=$
23
$8×8+7=$
71
$7×8+5=$
61
$4×6+7=$
31
$6×8+2=$
50
$8×6+3=$
51
$7×3+4=$
25
$3×3+4=$
13
$3×9+7=$
34
答案：
19
47
24
62
60
40
26
21
27
42
19
21
50
11
42
56
19
19
23
71
61
31
50
51
25
13
34
47
24
62
60
40
26
21
27
42
19
21
50
11
42
56
19
19
23
71
61
31
50
51
25
13
34
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