人教版四年級數(shù)學(xué)下冊《6-2 小數(shù)加減混合運(yùn)算》練習(xí)題教學(xué)課件PPT優(yōu)秀公開課

1、六六 小數(shù)的加法和減小數(shù)的加法和減法法第第2 2節(jié)節(jié) 小數(shù)加減混合運(yùn)小數(shù)加減混合運(yùn)算算4 4元元6 6角角2 2分分=4.62=4.62元元3 3元元8 8分分=3.08=3.08元元4.624.62元元+3.08+3.08元元=7.70=7.70元元9 9米米4141厘厘米米=9.41=9.41米米5 5米米8 8分分米米=5.8=5.8米米9.419.41米米-5.8-5.8米米=3.61=3.61米米4 4噸噸6060千千克克=4.06=4.06噸噸870870千千克克 =0.87=0.87噸噸4.064.06噸噸-0.87-0.87噸噸 =3.19=3.19噸噸1818噸噸300300

2、千千克克=18.3=18.3噸噸1212噸噸630630千千克克=12.63=12.63噸噸18.318.3噸噸-12.63-12.63噸噸=5.67=5.67噸噸1 113.513.55 55.255.25左左右右17.417.45 5小括小括號號右右5.255.255.25.25 5=0.81-0.6=0.81-0.6=0.21=0.21=13.9-4.2=13.9-4.2=9.7=9.7=45.7-9.17=45.7-9.17=36.53=36.53=7.2+45.3=7.2+45.3=52.5=52.5=83.9+16.5=83.9+16.5=100.4=100.4=30-13.19=

3、30-13.19=16.81=16.8120-6.72-9.8320-6.72-9.83=13.28-9.83=13.28-9.83=3.45=3.45（噸（噸）答：還剩下答：還剩下3.453.45噸噸。12.112.13.783.782.72.72.62.64004004.184.1815153.723.725.5.7 73.3.8 84 48.078.075.95.91.91.91 13.73.716.216.22.2.1 13.3.6 62.2.2 22.82.8=6.04+3.0=6.04+3.04 4=9.08=9.08=50.15-32.1=50.15-32.19 9=17.96=

4、17.96=61.9-4.7=61.9-4.79 9=57.11=57.11=8.22+8.5=8.22+8.53 3=16.75=16.75=159-120.3=159-120.39 9=38.61=38.61=72.8+64.5=72.8+64.55 5=137.35=137.3520-20-（8.5+3.88.5+3.8）=20-12.3=20-12.3=7.7=7.7（元（元）答：應(yīng)找回答：應(yīng)找回7.77.7元元。5.46+4.69-0.155.46+4.69-0.15=10.15-0.15=10.15-0.15=10=10（元（元）答：姐姐用現(xiàn)金支付了答：姐姐用現(xiàn)金支付了1010元元。20-2.7-7.520-2.7-7.5=17.3-7.5=17.3-7.5=9.8=9.8（元（元）答：數(shù)學(xué)家的故事每本答：數(shù)學(xué)家的故事每本9.89.8元元。58.08-13.78-14.55-14.3558.08-13.78-14.55-14.35=44.3-14.55-14.35=44.3-14.55-14.35=29.75-14.3=29.75-14.35 5=15.4=15.4（秒（秒）15.4-13.78=1.6215.4-13.78=1.62（秒（秒）答：第四棒用