《2025年53天天练二年级数学下册人教版》

方法练
$\begin{cases}3 + 2 = \\3000 + 2000 = \end{cases}$
$\begin{cases}6 + 3 = \\6000 + 3000 = \end{cases}$
$\begin{cases}9 - 4 = \\9000 - 4000 = \end{cases}$
$\begin{cases}8 - 5 = \\8000 - 5000 = \end{cases}$
$\begin{cases}80 + 50 = \\130 - 80 = \\130 - 50 = \end{cases}$
$\begin{cases}60 + 90 = \\150 - 60 = \\150 - 90 = \end{cases}$
$\begin{cases}800 + 600 = \\1400 - 800 = \\1400 - 600 = \end{cases}$
$\begin{cases}2000 + 1000 = \\3000 - 1000 = \\3000 - 2000 = \end{cases}$

答案： 第一列：5 5000 9 9000 5 5000 3 3000 130 50 80 150 90 60 1400 600 800 3000 2000 1000

新知练
$200 + 500 =$
$900 + 600 =$
$800 + 700 =$
$500 - 300 =$
$400 + 600 =$
$120 - 30 =$
$300 + 1000 =$
$2900 - 900 =$
$1300 - 400 =$
$1000 + 200 =$
$1200 - 600 =$
$1500 - 800 =$
$7600 - 7000 =$
$3000 + 4000 =$
$4000 + 5000 =$
$1400 - 400 =$
$1800 - 900 =$
$3000 + 6000 =$
$8000 - 2000 =$
$9000 - 7000 =$

答案： 第二列：700 1500 1500 200 1000 90 1300 2000 900 1200 600 700 600 7000 9000 1000 900 9000 6000 2000

应用练
$600 - ( ) = 200$
$1400 - ( ) = 700$
$2900 + ( ) = 3900$
$( ) - 300 = 1000$
$( ) - 900 = 300$
$( ) + 4000 = 4200$
$( ) + 1500 = 2000$
$( ) + 800 = 1600$
$150 - ( ) = 70$
$500 + ( ) = 1200$
$1700 - ( ) = 800$
$580 = ( ) + 80$
$8400 = ( ) + 3400$
$( ) - 3000 = 6000$
$( ) + 800 = 3000$
$2000 - ( ) = 900$
$2400 + ( ) = 2900$
$3700 + ( ) = 4700$
$900 - ( ) = 800$
$( ) + 2000 = 5000$

答案： 第三列：400 700 1000 1300 1200 200 500 800 80 700 900 500 5000 9000 2200 1100 500 1000 100 3000