《2025年口算训练二年级数学上册北师大版双色升级版》

第21片
$81 - 16 = $
$76 - 8 = $
$32 - 15 = $
$61 - 14 = $
$60 - 18 = $
$66 - 9 = $
$41 - 17 = $
$21 - 12 = $
$70 - 26 = $
$42 - 17 = $
$32 - 13 = $
$52 - 18 = $
$70 - 23 = $
$81 - 18 = $
$60 - 29 = $
$85 - 17 = $
$20 - 9 = $
$67 - 19 = $
$80 - 24 = $
$73 - 14 = $

答案： 解析：题目考查的是100以内数的减法运算。
答案：
$81 - 16 = 65$
$76 - 8 = 68$
$32 - 15 = 17$
$61 - 14 = 47$
$60 - 18 = 42$
$66 - 9 = 57$
$41 - 17 = 24$
$21 - 12 = 9$
$70 - 26 = 44$
$42 - 17 = 25$
$32 - 13 = 19$
$52 - 18 = 34$
$70 - 23 = 47$
$81 - 18 = 63$
$60 - 29 = 31$
$85 - 17 = 68$
$20 - 9 = 11$
$67 - 19 = 48$
$80 - 24 = 56$
$73 - 14 = 59$

第22片
$92 - 17 = $
$33 - 28 = $
$60 - 16 = $
$62 - 17 = $
$33 - 16 = $
$80 - 23 = $
$53 - 18 = $
$70 - 12 = $
$72 - 36 = $
$93 - 9 = $
$43 - 17 = $
$33 - 18 = $
$50 - 17 = $
$25 - 16 = $
$53 - 19 = $
$42 - 15 = $
$47 - 25 = $
$72 - 15 = $
$76 - 29 = $
$51 - 38 = $

答案： 解析：这些题目都是100以内数的减法运算，需要掌握两位数减两位数的退位减法。
答案：
$92 - 17 = 75$
$33 - 28 = 5$
$60 - 16 = 44$
$62 - 17 = 45$
$33 - 16 = 17$
$80 - 23 = 57$
$53 - 18 = 35$
$70 - 12 = 58$
$72 - 36 = 36$
$93 - 9 = 84$
$43 - 17 = 26$
$33 - 18 = 15$
$50 - 17 = 33$
$25 - 16 = 9$
$53 - 19 = 34$
$42 - 15 = 27$
$47 - 25 = 22$
$72 - 15 = 57$
$76 - 29 = 47$
$51 - 38 = 13$

第23片
列竖式计算。

答案： 解析：本题主要考查100以内数的减法竖式计算，通过列竖式的方式，相同数位对齐，从个位减起，哪一位不够减就从前一位借1当10再减，来得出结果。
答案：
53 - 26 = 27
$\begin{array}{r r r} &\phantom{0}5&3 \\ - &2&6 \\ \hline &\phantom{0}2&7 \end{array}$
90 - 19 = 71
$\begin{array}{r r r} &9&0 \\ - &1&9 \\ \hline &7&1 \end{array}$
85 - 39 = 46
$\begin{array}{r r r} &8&5 \\ - &3&9 \\ \hline &4&6 \end{array}$
43 - 14 = 29
$\begin{array}{r r r} &4&3 \\ - &1&4 \\ \hline &2&9 \end{array}$
80 - 27 = 53
$\begin{array}{r r r} &8&0 \\ - &2&7 \\ \hline &5&3 \end{array}$
51 - 3 = 48
$\begin{array}{r r r} &5&1 \\ - &\phantom{0}3& \\ \hline &4&8 \end{array}$