专练三 8.小数加减混合运算-【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 8 小数加减混合运算 易错剖析 高频易错点：未正确运用小数加减混合运算的运算顺序（易错指数●●） 脱式计算：7.96-1.2+1.3 错解：7.96-1.2+1.3 正解：7.96-1.2+1.3 =7.96-2.5 =6.76+1.3 错在先算加法 =5.46 =8.06 应从左往右 依次计算 学以致用 ①7.88-2.6+3.22 ②6.9-3.68+1.2 ③14.7-1.5+3.3 ④25.8-17.3+6.2 ⑤18.88-6.24+9.3 ⑥6.32-5.3+3.22 心 ⑦2.4-0.53+0.2 ⑧7.58-2.4+1.3 ⑨12.6-4.3+5.1 = ⑩8.98-（5.42+2.33)①7.35+3.42-1.23 1②2.7+9.73-0.61 41 竖式 四年级 下册 ③17.7+2.1-6.38 ④3.86+0.11-0.23 ⑤7.24+0.36-0.52 = = = = ⑥3.6+1.8-3.2 ⑦12.87+3.1-3.01 ⑧12.6+3.2-9.5 = = 1922.9-9.56+12.12 204.32-1.26+2.1 2①5.18-（2.36+1.62) = = ②②34.1-(5.6+2.39） 235.85-2.35+1.2 ④14.7-3.6+4.8 = 255.8+1.8-1.1 2⑤24.8+14.6-15.4 2⑦15.5-12.1+3.36 = = ②88.35-3.52+3.52 2918-6.45+8 301.35+3.13-2.8 心 = = = 二 ③①8.7+0.61-1.26 324.88+3.1-5.28 336.85-3.15+2.7 二 426?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