专练三 9.整数加法运算律推广到小数(1)-【AI•易错题】2025-2026学年四年级数学下册竖式练习（人教版）

专练三 小数的加法和减法 9 整数加法运算律推广到小数（1)》 易错剖析 高频易错点：忽略数与数之间的关系及每个数前面的运算符号，导致计 算错误易错指数●●。 用简便方法计算：7.84+3.16-7.84+3.16 错解：7.84+3.16-7.84+3.16 正解：7.84+3.16-7.84+3.16 =(7.84+3.16)-(7.84+3.16) =（7.84-7.84）+(3.16+3.16) =11-11 误用加法结合律 =0+6.32 =0 致误 =6.32 学以致用 ①14.7+5.9-14.7+5.9 ②2.36+3.53-2.36+3.53 ③5.9+3.4-5.9+3.4 = = ④3.7+1.5-3.7+1.5 ⑤9.87+2.2-9.87+2.2 ⑥15.36+2.23-15.36+2.23 = = ⑦0.9+0.1-0.9+0.1 ⑧4.68+5.1-4.68+5.1 ⑨10+5.5-10+5.5 = 43 竖式 四年级 下册 ⑩0.9+3.83+0.1 ①32.57+13.8+24.43 ②26.49+12.88+16.51 = 之 = = ③8.11+13.27+0.89 1419.5-4.5-4.5 ⑤24.38+12.76-14.38 心 = = = 1⑥23.21+8.7+15.3+6.791⑦26.8+7.5+13.2+32.5 1822.5+11.9+4.1 = h = ⑨25.2+2.4+11.6 2014.73+13.63+15.27+6.37②①39.73-20.39-13.61 = = = ②235.72+6.19+3.81 2343.89-（23.89+7.83)2④26.77-15.31+19.23 = = 人 = 二 ②⑤27.61+13.7+1639+11.32⑥31.19+（13.81+6.93)2@31.73-(12.56-7.27) 446?小数连加 ①9.38②3.29③6.22④2.72 ⑤3.05⑥9.72⑦2.86⑧5.6 ⑨6.2⑩6.8①5.7②9.9 ⑦？小数连减 ①0.8②0.1③0.4④4.6⑤1 ⑥3⑦15⑧5.1⑨0.8⑩3.5 ①2.1②1.17 ⑧？小数加减混合运算 ①8.5②4.42③16.5④14.7 ⑤21.94⑥4.24⑦2.07⑧6.48 ⑨13.4101.231①9.541211.82 ③13.42④3.74⑤7.08⑥2.2 ⑦12.96⑧6.3⑨25.46④5.16 ②①1.2②26.11③4.7②④15.9 256.526242⑦6.76288.35 2919.553@1.68③①8.05322.7 336.4 9?整数加法运算律推广到小数(1) ①11.8②7.06③6.8④3⑤4.4 参考答案 ⑥4.46⑦0.2⑧10.2⑨11⑩4.83 ①70.8②55.88③22.27④10.5 ⑤22.76⑥54⑦80⑧38.5⑨39.2 ⑩50②①5.73②②45.72②312.17 ④30.69②⑤69②⑤51.93@26.44 10整数加法运算律推广到小数(2) ①20②10③16④21⑤14 ⑥13⑦46.7⑧63.3⑨38.85 ⑩33.3①23.02②17.3③9.9 ④6.78⑤20.67⑥22.76⑦34.98 ⑧22.73⑨9.882⑩37.7②@41.4 ②②43.5332.4②④53.78⑤37.35 2④41.9⑦45.8 阶段练习(5) 1.①7.33②4.18③10.15④7.6 ⑤0.2⑥6.36⑦5.96⑧9.63 ⑨5.81⑩2.45①8.7②8.9 ③2.32④8.8⑤2.76 2.①7.85②9.84③37.62④0.39 59