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5$16×3 =$ $2.6×3 =$ $1.6×20 =$
$24×5 =$ $2.2×40 =$ $4.7×30 =$
$18×7 =$ $3.5×80 =$ $5.6×40 =$
$31×4 =$ $3.5×60 =$ $8.1×60 =$
$56×2 =$ $50×6.2 =$ $4.2×30 =$
$28×5 =$ $3.7×4 =$ $3.4×80 =$
$73×5 =$ $0.85×4 =$ $43.2×30 =$
$93×4 =$ $2.6×30 =$ $4.6×90 =$
$47×3 =$ $4.6×20 =$ $4.7×50 =$
$64×2 =$ $94×0.3 =$ $8.3×60 =$
$46×6 =$ $23×0.6 =$ $2.4×70 =$
$26×4 =$ $4.6×5 =$ $9.3×20 =$
$78×3 =$ $2.8×4 =$ $5.4×80 =$
$24×5 =$ $2.2×40 =$ $4.7×30 =$
$18×7 =$ $3.5×80 =$ $5.6×40 =$
$31×4 =$ $3.5×60 =$ $8.1×60 =$
$56×2 =$ $50×6.2 =$ $4.2×30 =$
$28×5 =$ $3.7×4 =$ $3.4×80 =$
$73×5 =$ $0.85×4 =$ $43.2×30 =$
$93×4 =$ $2.6×30 =$ $4.6×90 =$
$47×3 =$ $4.6×20 =$ $4.7×50 =$
$64×2 =$ $94×0.3 =$ $8.3×60 =$
$46×6 =$ $23×0.6 =$ $2.4×70 =$
$26×4 =$ $4.6×5 =$ $9.3×20 =$
$78×3 =$ $2.8×4 =$ $5.4×80 =$
答案
无（本题为计算题，无选择题形式，故无ABCD类答案）
解析
本题可根据小数和整数的乘法运算规则来计算各算式的结果。
计算整数乘法时，从右起，依次用第二个因数每位上的数去乘第一个因数，乘到哪一位，得数的末尾就和第二个因数的哪一位对齐，然后把几次乘得的数加起来。
计算小数乘法时，先按照整数乘法的法则算出积，再看因数中一共有几位小数，就从得数的右边起数出几位，点上小数点。
以下为各算式的计算结果：
$16×3 = 48$
$2.6×3 = 7.8$
$1.6×20 = 32$
$24×5 = 120$
$2.2×40 = 88$
$4.7×30 = 141$
$18×7 = 126$
$3.5×80 = 280$
$5.6×40 = 224$
$31×4 = 124$
$3.5×60 = 210$
$8.1×60 = 486$
$56×2 = 112$
$50×6.2 = 310$
$4.2×30 = 126$
$28×5 = 140$
$3.7×4 = 14.8$
$3.4×80 = 272$
$73×5 = 365$
$0.85×4 = 3.4$
$43.2×30 = 1296$
$93×4 = 372$
$2.6×30 = 78$
$4.6×90 = 414$
$47×3 = 141$
$4.6×20 = 92$
$4.7×50 = 235$
$64×2 = 128$
$94×0.3 = 28.2$
$8.3×60 = 498$
$46×6 = 276$
$23×0.6 = 13.8$
$2.4×70 = 168$
$26×4 = 104$
$4.6×5 = 23$
$9.3×20 = 186$
$78×3 = 234$
$2.8×4 = 11.2$
$5.4×80 = 432$
计算整数乘法时，从右起，依次用第二个因数每位上的数去乘第一个因数，乘到哪一位，得数的末尾就和第二个因数的哪一位对齐，然后把几次乘得的数加起来。
计算小数乘法时，先按照整数乘法的法则算出积，再看因数中一共有几位小数，就从得数的右边起数出几位，点上小数点。
以下为各算式的计算结果：
$16×3 = 48$
$2.6×3 = 7.8$
$1.6×20 = 32$
$24×5 = 120$
$2.2×40 = 88$
$4.7×30 = 141$
$18×7 = 126$
$3.5×80 = 280$
$5.6×40 = 224$
$31×4 = 124$
$3.5×60 = 210$
$8.1×60 = 486$
$56×2 = 112$
$50×6.2 = 310$
$4.2×30 = 126$
$28×5 = 140$
$3.7×4 = 14.8$
$3.4×80 = 272$
$73×5 = 365$
$0.85×4 = 3.4$
$43.2×30 = 1296$
$93×4 = 372$
$2.6×30 = 78$
$4.6×90 = 414$
$47×3 = 141$
$4.6×20 = 92$
$4.7×50 = 235$
$64×2 = 128$
$94×0.3 = 28.2$
$8.3×60 = 498$
$46×6 = 276$
$23×0.6 = 13.8$
$2.4×70 = 168$
$26×4 = 104$
$4.6×5 = 23$
$9.3×20 = 186$
$78×3 = 234$
$2.8×4 = 11.2$
$5.4×80 = 432$
填一填
$620 cm = ( )dm = ( )m$ $5.2 dm² = ( )cm²$
$5600 cm² = ( )dm² = ( )m²$ $23 dm² = ( )m²$
$5.03 m² = ( )dm² = ( )cm²$ $120 dm² = ( )cm²$
$2000 cm² = ( )dm² = ( )m²$ $910 cm² = ( )dm²$
$0.06 m² = ( )dm² = ( )cm²$ $8000 cm² = ( )dm²$
$620 cm = ( )dm = ( )m$ $5.2 dm² = ( )cm²$
$5600 cm² = ( )dm² = ( )m²$ $23 dm² = ( )m²$
$5.03 m² = ( )dm² = ( )cm²$ $120 dm² = ( )cm²$
$2000 cm² = ( )dm² = ( )m²$ $910 cm² = ( )dm²$
$0.06 m² = ( )dm² = ( )cm²$ $8000 cm² = ( )dm²$
答案
$620 cm = \boxed{62}dm = \boxed{6.2}m$，
$5.2 dm² = \boxed{520}cm²$，
$5600 cm² = \boxed{56}dm² = \boxed{0.56}m²$，
$23 dm² = \boxed{0.23}m²$，
$5.03 m² = \boxed{503}dm² = \boxed{50300}cm²$，
$120 dm² = \boxed{12000}cm²$，
$2000 cm² = \boxed{20}dm² = \boxed{0.2}m²$，
$910 cm² = \boxed{9.1}dm²$，
$0.06 m² = \boxed{6}dm² = \boxed{600}cm²$，
$8000 cm² = \boxed{80}dm²$。
解析
1. 长度单位换算：
$1dm=10cm$，$1m=10dm=100cm$，
$620cm=620÷10=62dm$，
$620cm=620÷100=6.2m$；
2. 面积单位换算：
$1dm^2=100cm^2$，$1m^2=100dm^2=1000000cm^2$，
$5.2dm^2=5.2×100=520cm^2$；
$5600cm^2=5600÷100=56dm^2=56÷100=0.56m^2$；
$23dm^2=23÷100=0.23m^2$；
$5.03m^2=5.03×100=503dm^2=503×100=50300cm^2$；
$120dm^2=120×100=12000cm^2$；
$2000cm^2=2000÷100=20dm^2=20÷100=0.2m^2$；
$910cm^2=910÷100=9.1dm^2$；
$0.06m^2=0.06×100=6dm^2=6×100=600cm^2$；
$8000cm^2=8000÷100=80dm^2$。
