最新认识角-学科信息：数学-北师大版-二年级下PPT课件.ppt

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1、认识角-学科信息：数学-北师大版-二年级下下面图形中哪些是角，哪些不是角？√√××××2341第二关：数一数数学游乐园（）个（）个（）个（）个（）个（）个（0）个（5）个（0）个（1）个（2）个（2）个大家来做角点对点，边对边。猜一猜，哪个角大？第三关：智力大比拼数学游乐园自我介绍我叫角，我有。。。总结：小小角，真简单，一个顶点两条边。画角时，要牢记，先画顶点再画边。比大小，有妙招，只看叉口不看边。叉口越大角越大，叉口越小角越小。这节课你收获了什么？再见1.5×4=2.5×4=0.13×4=5.4÷10=0.18×0.3=4.2×1000=0.45÷0.15=3.6

2、÷0.1=8.5×100=8.5÷1.7=3.2÷100=1.2÷0.30.49÷7=0.04×25=0.096÷0.03=84÷4.2=1000×0.756=0.5×100=0÷0.25=1÷0.01=1.25×8=3.8×2=7.2÷0.9=1.6×0.2=9.3÷0.3=4÷0.4=0.45÷0.50.2÷0.01=0.9×6=2.1×0.3=7×0.08=1.87×0=0.24×5=0.2×0.5=60×0.5=0.05×1.6=0.5×1.1=0.8×0.5=6÷0.12=1.25×4=4×0.25=0.4÷8=1.8×0.5=8÷0.5=0.32÷16=2

3、.5÷10=6.3÷2.1=0.92÷4=80÷1.6=6.2＋1.7=0.56÷14=1.6÷0.8=6.3÷9=0.15×8=7.2÷0.6=4.2÷1.4=3.9÷3.9=0÷6.81=1.47×0.4=0.4×0.25＝0.8×7＝1.5×7＝1.32×8＝0.7×8＝10.3×2＝5×0.6＝3.21×23＝3.21×2.3＝32.1×2.3＝10×0.05＝0.13×7＝0.21×100＝0.7×4＝0.05×4＝4×0.3＝12.5×8＝2.3×4＝3.25×0＝0.4×50＝3.21×0.23＝321×0.023＝0.9×0.3＝3.5×0.2＝2.01×

4、0＝30×0.1＝2.6×3＝4.1×2＝0.35×0.2＝7.5×0.1＝2.5×0.4＝2.4×5＝0.22×4＝0.9－0.52＝3.99×1＝0×3.52＝7.2÷6＝4.4÷4＝3.6÷3＝5.2÷2＝1.5×3＝1.2×0.4＝3.6÷3＝2.7÷3＝0.12÷3＝0.45÷9＝3.6÷6＝2.7÷2＝1.2÷3＝0.45÷4＝2.5÷5＝8.4÷7＝0.34÷17＝2.5÷0.5＝8.4÷0.7＝0.34÷0.17＝30.4÷4＝1.2×6＝0.72÷0.6＝1.6×5＝0.9＋1.4＝0.2×0.4＝8.2＋1.8＝100－35.22＝2.6÷1.3＝0.

5、6×0.3＝0÷3.65＝7.82÷1＝1.4÷0.7＝3.6÷0.06＝5.6÷0.9＝0.48÷0.8＝4.4÷0.11＝4.2×3＝0.3÷0.01＝4÷0.5＝5.1÷0.17＝0.9÷0.45＝9.6÷16＝1.25×8＝1÷0.01＝3÷4＝8.1÷9＝2.5×4＝3.6＋6.3＝0.05×4＝3.5×0＝1－0.08＝3.5×0.01＝1.25÷0.25＝3.9＋0.39＝4.8＋5.2＝0.5×0.4＝6.4÷4﹦1.5÷0.3﹦4.2×3﹦2.5×2=0.5×10=0.6×8=2.1×2=2.8×10=0.7×0.8=0.04×20=5.6+0.4=4.

6、7+2.3=4.5×2=6.9－2.5=7.2×0.8=6×3.4=0.62－0.32=1.4×0.5=0.75×100=0.02×0.5=3.6×0.3=6.3÷7=5.6×100=0.75÷0.25=0.125×8=4.8÷0.3=0.86÷2=0.56÷28=0.36÷0.4=0.64÷0.8=0.7×9=3.6÷24=0.8×1.1=7.2+12.8=46.7－3.8=12.8÷4=5.2÷13=12.5÷5=1.64+4.1=10÷20=24÷15=8.65×10=0.35×0.6=3.08×0.01=4.95×1000=6.9×0.1=0.4×0.5=2.

7、4÷0.8=10.8÷9=9.6÷0.8=0.108÷2=4.95÷0.9=9.65÷0.1=0.325×100=2.5×8=0.25×0.4=1.6÷0.8=1÷2.5=1.25×0.8=3.2÷0.04=0÷1.7=0.22×102=9.6÷0.8=5×0.24=4.5－0.05=0.6×8＝2.05×100＝0.04×0.3＝0.4×0.25＝0.56÷0.7=0.125×4=3.28×0.1=3.9÷0.13=7.2×0.1=0.01×0.1=3.2÷5=7×0.62=0.56÷0.8=7.4－2.8=0.18÷0.