1. 直接写得数。
①$11.25×8=$
②$12.5×8=$
③$1.76×5=$
④$1.4×3=$
⑤$0.14×30=$
⑥$1.6×5=$
⑦$1.2×6=$
⑧$0.25×4=$
⑨$4.3×40=$
⑩$1.5×7=$
⑪$7.56×1=$
⑫$0.08×7=$
⑬$0.8×7=$
⑭$3.6×2=$
⑮$6.9×2=$
⑯$7.2×4=$
⑰$8.1×30=$
⑱$2.2×6=$
⑲$5.1×7=$
⑳$0.12×4=$
㉑$8.1×7=$
㉒$0.4×70=$
㉓$5.9×2=$
㉔$8.5×6=$
㉕$1.5×20=$
㉖$4.9×6=$
㉗$4.18×3=$

①$11.25×8=90$
②$12.5×8=100$
③$1.76×5=8.8$
④$1.4×3=4.2$
⑤$0.14×30=4.2$
⑥$1.6×5=8$
⑦$1.2×6=7.2$
⑧$0.25×4=1$
⑨$4.3×40=172$
⑩$1.5×7=10.5$
⑪$7.56×1=7.56$
⑫$0.08×7=0.56$
⑬$0.8×7=5.6$
⑭$3.6×2=7.2$
⑮$6.9×2=13.8$
⑯$7.2×4=28.8$
⑰$8.1×30=243$
⑱$2.2×6=13.2$
⑲$5.1×7=35.7$
⑳$0.12×4=0.48$
㉑$8.1×7=56.7$
㉒$0.4×70=28$
㉓$5.9×2=11.8$
㉔$8.5×6=51$
㉕$1.5×20=30$
㉖$4.9×6=29.4$
㉗$4.18×3=12.54$

2. 算一算，得数保留一位小数。
①$4.48×0.5≈$
②$4.14×4≈$
③$9.8×0.4≈$
④$2.5×0.3≈$
⑤$4.1×0.09≈$
⑥$7×0.34≈$
⑦$30.2×0.125≈$
⑧$1.5×0.9≈$
⑨$2.32×0.3≈$
⑩$0.125×6≈$
⑪$0.54×2.8≈$
⑫$1.85×0.6≈$
⑬$0.3×2.91≈$
⑭$8.3×0.2≈$
⑮$6.72×3.2≈$
⑯$35.6×0.52≈$
⑰$34.3×0.23≈$
⑱$2.16×3.6≈$
⑲$2.85×0.43≈$
⑳$6.24×0.51≈$
㉑$0.53×0.63≈$
㉒$1.191×1≈$
㉓$1.25×4.1≈$
㉔$0.12×3≈$
㉕$10.3×0.4≈$
㉖$4.2×0.6≈$
㉗$0.81×4≈$
㉘$0.39×7≈$
㉙$3.58×2≈$
㉚$35.5×0.5≈$

①$4.48×0.5≈2.2$
②$4.14×4≈16.6$
③$9.8×0.4≈3.9$
④$2.5×0.3≈0.8$
⑤$4.1×0.09≈0.4$
⑥$7×0.34≈2.4$
⑦$30.2×0.125≈3.8$
⑧$1.5×0.9≈1.4$
⑨$2.32×0.3≈0.7$
⑩$0.125×6≈0.8$
⑪$0.54×2.8≈1.5$
⑫$1.85×0.6≈1.1$
⑬$0.3×2.91≈0.9$
⑭$8.3×0.2≈1.7$
⑮$6.72×3.2≈21.5$
⑯$35.6×0.52≈18.5$
⑰$34.3×0.23≈7.9$
⑱$2.16×3.6≈7.8$
⑲$2.85×0.43≈1.2$
⑳$6.24×0.51≈3.2$
㉑$0.53×0.63≈0.3$
㉒$1.191×1≈1.2$
㉓$1.25×4.1≈5.1$
㉔$0.12×3≈0.4$
㉕$10.3×0.4≈4.1$
㉖$4.2×0.6≈2.5$
㉗$0.81×4≈3.2$
㉘$0.39×7≈2.7$
㉙$3.58×2≈7.2$
㉚$35.5×0.5≈17.8$