《2025年灵机一动小学数学口算心算三年级上册苏教版》

竖式计算练习 6
1
89×7=623
$\begin{array}{r r r}&&&&8&9 \\ ×&&&&&7 \\ \hline &&&6&2&3 \end{array}$
2
248×3=744
$\begin{array}{r r r}&&&2&4&8 \\ ×&&&&&3 \\ \hline &&&7&4&4 \end{array}$
3
537×8=4296
$\begin{array}{r r r}&&&5&3&7 \\ ×&&&&&8 \\ \hline &&4&2&9&6 \end{array}$
4
305×9=2745
$\begin{array}{r r r}&&&3&0&5 \\ ×&&&&&9 \\ \hline &&2&7&4&5 \end{array}$
5
420×6=2520
$\begin{array}{r r r}&&&4&2&0 \\ ×&&&&&6 \\ \hline &&2&5&2&0 \end{array}$
6
732×5=3660
$\begin{array}{r r r}&&&7&3&2 \\ ×&&&&&5 \\ \hline &&3&6&6&0 \end{array}$
*639×3=1917
$\begin{array}{r r r}&&&6&3&9 \\ ×&&&&&3 \\ \hline &&1&9&1&7 \end{array}$
验算：1917 ÷ 3 = 639 或 3 × 639 = 1917
*238×4=952
$\begin{array}{r r r}&&&2&3&8 \\ ×&&&&&4 \\ \hline &&&9&5&2 \end{array}$
验算：952 ÷ 4 = 238 或 4 × 238 = 952
*865×2=1730
$\begin{array}{r r r}&&&8&6&5 \\ ×&&&&&2 \\ \hline &&1&7&3&0 \end{array}$
验算：1730 ÷ 2 = 865 或 2 × 865 = 1730

答案： 1. $89 × 7 = 623$
$\begin{array}{r r r}&&&&8&9 \\ ×&&&&&7 \\ \hline &&&6&2&3 \end{array}$
2. $248 × 3 = 744$
$\begin{array}{r r r}&&&2&4&8 \\ ×&&&&&3 \\ \hline &&&7&4&4 \end{array}$
3. $537 × 8 = 4296$
$\begin{array}{r r r}&&&5&3&7 \\ ×&&&&&8 \\ \hline &&4&2&9&6 \end{array}$
4. $305 × 9 = 2745$
$\begin{array}{r r r}&&&3&0&5 \\ ×&&&&&9 \\ \hline &&2&7&4&5 \end{array}$
5. $420 × 6 = 2520$
$\begin{array}{r r r}&&&4&2&0 \\ ×&&&&&6 \\ \hline &&2&5&2&0 \end{array}$
6. $732 × 5 = 3660$
$\begin{array}{r r r}&&&7&3&2 \\ ×&&&&&5 \\ \hline &&3&6&6&0 \end{array}$
7. $639 × 3 = 1917$ (需要验算)
$\begin{array}{r r r}&&&6&3&9 \\ ×&&&&&3 \\ \hline &&1&9&1&7 \end{array}$
验算：$1917 ÷ 3 = 639$ 或 $3 × 639 = 1917$
8. $238 × 4 = 952$ (需要验算)
$\begin{array}{r r r}&&&2&3&8 \\ ×&&&&&4 \\ \hline &&&9&5&2 \end{array}$
验算：$952 ÷ 4 = 238$ 或 $4 × 238 = 952$
9. $865 × 2 = 1730$ (需要验算)
$\begin{array}{r r r}&&&8&6&5 \\ ×&&&&&2 \\ \hline &&1&7&3&0 \end{array}$
验算：$1730 ÷ 2 = 865$ 或 $2 × 865 = 1730$