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四年级下册数学小数的加法和减法简便计算
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四年级数学下册资料/
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2024-05-09
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四年级下册数学小数的加法和减法简便计算


简介：
(1)15.6-(15.6-2.5) =15.6-15.6+2.5 =0+2.5 =2.5 (2)3.5-0.29-0.71+16.5 =(3.5+16.5)-(0.29+0.71) =20-1 =19 (3)5.8+10.5+5.2 =5.8+5.2+10.5 =11+10.5 =21.5 (4)31.6-3.8-11.6 =31.6-11.6-3.8 =20-3.8 =16.2 (5)58.8-(18.8+2.9) =58.8-18.8-2.9 =40-2.9 =37.1 (6)35.6-12.6-17.4+4.4 =(35.6+4.4)-(12.6+17.4) =40-30 =10 (7)1.89+5.3+1.11 =1.89+1.11+5.3 =3+5.3 =8.3 (8)27.3-6.8-13.2 =27.3-(6.8+13.2) =27.3-20 =7.3 (9)38.2-9.7 =38.2-(10-0.3) =38.2-10+0.3 =28.5 (10)32.3-2.75+37.7-3.25 =(32.3+37.7)-(2.75+3.25) =70-6 =64