第一单元计算专项：小数的连乘运算（专项练习）-2026-2027学年六年级数学上册（苏教版）

第一单元计算专项：小数的连乘运算 知识，点梳理 1.运算顺序：小数连乘属于同级运算，从左往右依次计算；有小括号的要先算小括号里面 的。 2.计算方法：先按整数乘法算出积，再看因数中一共有几位小数，就从积的右边起数出几 位，点上小数点；末尾有0要化简。 3.简便技巧：观察数字特点，可利用乘法交换律、结合律调整顺序，如2.5×0.4=1、 1.25×0.8=1、0.25×4=1° 4.书写要点：脱式计算，一步一步算，等号对齐；算完后检查小数位数。 5.注意：连乘没有括号时不能随意跳步；能简算的要写出简算过程。 启专项练习 考点1：两个一位小数连乘（从左往右依次计算) (1)2.5×1.2×3.1 (2)1.8×2.2×1.5 (3)3.2×1.4×2.0 (4)4.1×1.3×2.1 (5)2.4×1.5×3.2 (6)1.6×2.3×1.2 第1页共12页 (7)3.5×1.2×2.4 (8)2.1×1.8×1.6 (9)1.9×2.0×3.3 (10)2.8×1.1×2.5 (11)3.3×1.2×1.4 (12)1.5×2.6×1.8 (13)4.2×1.1×1.3 (14)2.2×1.5×2.2 (15)1.7×2.1×1.4 (16)3.6×1.0×2.5 (17)2.3×1.4×1.6 (18)1.4×2.5×1.9 考点2：一位小数×一位小数×两位小数连乘 (1)2.4×1.5×1.25 (2)1.6×2.2×1.04 (3)3.1×1.2×2.12 (4)2.5×1.3×1.16 (5)1.8×1.4×2.05 (6)3.2×1.1×1.33 第2页共12页 (7)2.1×1.5×1.24 (8)1.5×2.3×1.08 (9)2.6×1.2×1.15 (10)1.7×2.0×1.42 (11)3.4×1.1×1.22 (12)2.2×1.3×1.06 (13)1.9×1.5×2.11 (14)2.8×1.0×1.35 (15)1.4×2.4×1.12 (16)3.5×1.2×1.02 (17)2.3×1.1×1.26 (18)1.6×1.5×2.03 考点3：含两位小数的三个小数连乘 (1)1.25×2.04×1.3 (2)2.12×1.1×1.4 (3)1.05×2.2×1.6 (4)1.32×1.2×2.1 (5)2.08×1.5×1.1 (6)1.14×2.3×1.2 第3页共12页 (7)1.45×1.2×1.3 (8)2.21×1.1×1.5 (9)1.06×2.4×1.2 (10)1.34×1.3×2.0 (11)2.15×1.2×1.1 (12)1.18×1.4×1.5 (13)1.22×2.1×1.3 (14)1.51×1.2×1.4 (15)2.03×1.3×1.1 (16)1.16×2.2×1.2 (17)1.44×1.1×1.5 (18)1.09×2.3×1.2 考点4：小数连乘，可运用乘法交换律简便计算 (1)2.5×3.7×0.4 (2)1.25×4.6×0.8 (3)0.25×2.8×4 (4)1.25×0.6×0.8 (5)0.4×5.9×2.5 (6)2.5×0.7×0.4 第4页共12页 (7)0.8×3.2×1.25 (8)4×1.6×0.25 (9)1.25×7.1×0.8 (10)0.25×6.4×4 (11)2.5×0.9×0.4 (12)0.8×1.5×1.25 (13)0.4×2.3×2.5 (14)1.25×2.4×0.8 (15)0.25×3.6×4 (16)2.5×4.4×0.4 (17)0.8×5.5×1.25 （18)4×0.88×0.25 考点5：带小括号的小数连乘 (1)2.4×(1.5×1.2) (2)1.8×(2.2×1.1) (3)3.1×(1.4×2.0)】 (4)1.6×(2.5×1.3） (5)2.2×(1.2×1.5) (6)3.5×(1.1×1.4 第5页共12页 连ZL并逆9熊 (ST×0T)×bE(8I) (EIx9I)x8I(LI) (ZI×SI)×乙(9I) (ZT×I'T)×E(SI) (I'T×9z)×bL(I) (TxZT)xS乙(EI) (ET×0'Z)×LT(I) (S'IxvI)×IZ(II) (I'T×ZT)×Z8(0I) (T乙×8T)×6T(6) (9T×0T)×8乙(8) (ZT×8Z)×ST(L) 参考答案 考点1：两个一位小数连乘 (1)2.5×1.2×3.1=3×3.1=9.3 (2)1.8×2.2×1.5=3.96×1.5=5.94 (3)3.2×1.4×2.0=4.48×2=8.96 (4)4.1×1.3×2.1=5.33×2.1=11.193 (5)2.4×1.5×3.2=3.6×3.2=11.52 (6)1.6×2.3×1.2=3.68×1.2=4.416 (7)3.5×1.2×2.4=4.2×2.4=10.08 (8)2.1×1.8×1.6=3.78×1.6=6.048 (9)1.9×2.0×3.3=3.8×3.3=12.54 (10)2.8×1.1×2.5=3.08×2.5=7.7 (11)3.3×1.2×1.4=3.96×1.4=5.544 (12)1.5×2.6×1.8=3.9×1.8=7.02 (13)4.2×1.1×1.3=4.62×1.3=6.006 (14)2.2×1.5×2.2=3.3×2.2=7.26 (15)1.7×2.1×1.4=3.57×1.4=4.998 (16)3.6×1.0×2.5=3.6×2.5=9 第7页共12页 (17)2.3×1.4×1.6=3.22×1.6=5.152 (18)1.4×2.5×1.9=3.5×1.9=6.65 考点2：一位小数×一位小数×两位小数连乘 （1)2.4×1.5×1.25=3.6×1.25=4.5 (2)1.6×2.2×1.04=3.52×1.04=3.6608 (3)3.1×1.2×2.12=3.72×2.12=7.8864 (4)2.5×1.3×1.16=3.25×1.16=3.77 (5)1.8×1.4×2.05=2.52×2.05=5.166 (6)3.2×1.1×1.33=3.52×1.33=4.6816 (7)2.1×1.5×1.24=3.15×1.24=3.906 (8)1.5×2.3×1.08=3.45×1.08=3.726 (9)2.6×1.2×1.15=3.12×1.15=3.588 (10)1.7×2.0×1.42=3.4×1.42=4.828 (11)3.4×1.1×1.22=3.74×1.22=4.5628 (12)2.2×1.3×1.06=2.86×1.06=3.0316 (13)1.9×1.5×2.11=2.85×2.11=6.0135 (14)2.8×1.0×1.35=2.8×1.35=3.78 (15)1.4×2.4×1.12=3.36×1.12=3.7632 第8页共12页 (16)3.5×1.2×1.02=4.2×1.02=4.284 (17)2.3×1.1×1.26=2.53×1.26=3.1878 (18)1.6×1.5×2.03=2.4×2.03=4.872 考点3：含两位小数的三个小数连乘 (1)1.25×2.04×1.3=2.55×1.3=3.315 (2)2.12×1.1×1.4=2.332×1.4=3.2648 (3)1.05×2.2×1.6=2.31×1.6=3.696 (4)1.32×1.2×2.1=1.584×2.1=3.3264 (5)2.08×1.5×1.1=3.12×1.1=3.432 (6)1.14×2.3×1.2=2.622×1.2=3.1464 (7)1.45×1.2×1.3=1.74×1.3=2.262 (8)2.21×1.1×1.5=2.431×1.5=3.6465 (9)1.06×2.4×1.2=2.544×1.2=3.0528 (10)1.34×1.3×2.0=1.742×2=3.484 (11)2.15×1.2×1.1=2.58×1.1=2.838 (12)1.18×1.4×1.5=1.652×1.5=2.478 (13)1.22×2.1×1.3=2.562×1.3=3.3306 (14)1.51×1.2×1.4=1.812×1.4=2.5368 第9页共12页 (15)2.03×1.3×1.1=2.639×1.1=2.9029 (16)1.16×2.2×1.2=2.552×1.2=3.0624 (17)1.44×1.1×1.5=1.584×1.5=2.376 (18)1.09×2.3×1.2=2.507×1.2=3.0084 考点4：小数连乘，可运用乘法交换律简便计算 (1)2.5×3.7×0.4=2.5×0.4×3.7=1×3.7=3.7 (2)1.25×4.6×0.8=1.25×0.8×4.6=1×4.6=4.6 (3)0.25×2.8×4=0.25×4×2.8=1×2.8=2.8 (4)1.25×0.6×0.8=1.25×0.8×0.6=1×0.6=0.6 (5)0.4×5.9×2.5=0.4×2.5×5.9=1×5.9=5.9 (6)2.5×0.7×0.4=2.5×0.4×0.7=1×0.7=0.7 (7)0.8×3.2×1.25=0.8×1.25×3.2=1×3.2=3.2 (8）4×1.6×0.25=4×0.25×1.6=1×1.6=1.6 (9)1.25×7.1×0.8=1.25×0.8×7.1=1×7.1=7.1 (10)0.25×6.4×4=0.25×4×6.4=1×6.4=6.4 (11)2.5×0.9×0.4=2.5×0.4×0.9=1×0.9=0.9 (12)0.8×1.5×1.25=0.8×1.25×1.5=1×1.5=1.5 (13)0.4×2.3×2.5=0.4×2.5×2.3=1×2.3=2.3 第10页共12页 (14)1.25×2.4×0.8=1.25×0.8×2.4=1×2.4=2.4 (15)0.25×3.6×4=0.25×4×3.6=1×3.6=3.6 (16)2.5×4.4×0.4=2.5×0.4×4.4=1×4.4=4.4 (17)0.8×5.5×1.25=0.8×1.25×5.5=1×5.5=5.5 (18)4×0.88×0.25=4×0.25×0.88=1×0.88=0.88 考点5：带小括号的小数连乘 (1)2.4×(1.5×1.2)=2.4×1.8=4.32 (2)1.8×(2.2×1.1)=1.8×2.42=4.356 (3)3.1×(1.4×2.0)=3.1×2.8=8.68 (4)1.6×(2.5×1.3)=1.6×3.25=5.2 (5)2.2×(1.2×1.5)=2.2×1.8=3.96 (6)3.5×(1.1×1.4)=3.5×1.54=5.39 (7)1.5×(2.3×1.2)=1.5×2.76=4.14 (8)2.8×(1.0×1.6)=2.8×1.6=4.48 (9)1.9×(1.3×2.1)=1.9×2.73=5.187 (10)3.2×(1.2×1.1=3.2×1.32=4.224 (11)2.1×(1.4×1.5)=2.1×2.1=4.41 (12)1.7×(2.0×1.3)=1.7×2.6=4.42 第11页共12页 (13)2.5×(1.2×1.4)=2.5×1.68=4.2 (14)1.4×(2.6×1.1)=1.4×2.86=4.004 (15)3.3×(1.1×1.2)=3.3×1.32=4.356 (16)2.3×(1.5×1.2)=2.3×1.8=4.14 (17)1.8×(1.6×1.3)=1.8×2.08=3.744 (18)3.4×(1.0×1.5)=3.4×1.5=5.1 第12页共12页