U5、harvest season —— divisor is double digit division 五、收获的季节——除数是两位数的除法
Lesson One 第一课 The cabbage collected sixty tons. 白菜收了60吨。 The radish collected thirty tons. 萝卜收了30吨。 Potatoes charge two hundred and ninety eight tons. 土豆收了298吨。 Can carry fifty tons at a time. 一次能运走50吨。 What questions can you ask? 你能提出什么问题? Cooperative exploration 合作探索 How many times the yield of cabbage is radish? 白菜的产量是萝卜的几倍? Sixty divided by thirty equals 60÷30= Thirty by two is sixty 30x 2=60 Six ten divided by three ten equals two. 6个十除以3个十等于2。 sixty divided by thirty equals two 60÷30=2 sixty divided by thirty equals two 60÷30=2 Six divided by three equals two 6÷3=2 sixty divided by thirty equals two 60÷30=2 A: the yield of cabbage is ____ times that of radish. 答:白菜的产量是萝卜的____倍 。 Will you count 600÷30 and 120÷40? 你会口算600÷30和120÷40吗? 298 tons of potatoes ,50 tons at a time. How many times will it take to complete the assessment? 298吨土豆，一次能运走50吨。估一估，需要几次才能运完? Two hundred and ninety eight divided by fifty is equal to about fifty 298÷50≈ (次) two hundred and ninety eight Close to three hundred consider two hundred and ninety eight as three hundred 298接近300，把298看作300。 Three hundred divided by fifty equals six 300÷50=6 Look at two hundred and ninety eight tons in the big, and the result is six times. The actual shipment is less than three hundred tons, so six times will definitely be completed. 把298吨往大里看，结果6次能运完。实际要运的比300吨少，所以6次肯定能运完。 A: it takes ___ times to finish. 答:需要___次才能运完。
Lesson two 第二课 There are 450 kg of persimmon. 还有450千克西柿没装。 There are 84 kilograms of cucumbers left unpacked. 还有84千克黄瓜没装。 There are also 240 kg eggplant ,28 kg per case. 还有240千克茄子，每箱装28千克。 What questions can you ask? 你能提出什么问题? Cooperative exploration 合作探索 How many boxes can 450 kilograms of tomatoes hold? 450千克西红柿能装多少箱? Four hundred fifty divided by thirty equals 450÷30=___ ( 箱) Why is the highest position of quotient written on ten? 为什么商的最高位写在十位上? A :450 kilograms of tomatoes can hold __ boxes. 答: 450千克西红柿能装__箱。 How many cases can 84 kg cucumber hold? 84千克黄瓜能装几箱? eighty-four divided by twenty-one equals 84÷21= (箱) twenty-one Close to twenty, think of twenty-one as a test quotient. 21接近20，把21看作20来试商。 A : eighty-four kg cucumber can be packed. 答: 84千克黄瓜能装 箱。 How many boxes can two hundred and forty kg eggplant fill? 240千克茄子能装满几箱? Two hundred forty divided by twenty eight 240÷28= twenty-four divided by twenty-eight is not enough to divide, so the quotient is one digit. 24除以28，不够除，所以商是一位数。 A :two hundred and forty kg eggplant can fill the box. 答: 240千克茄子能装满 箱。
Lesson three 第三课 Our 18 classmates picked 126 baskets of apples. 我们18个同学摘了126筐苹果。 Our 22 parents picked 638 baskets of apples. 我们22个家长摘了638筐苹果。 What questions can you ask? 你能提出什么问题? Cooperative exploration 合作探索 How many baskets did each student pick? 平均每个同学摘了多少筐? One hundred twenty six divided by eighteen 126÷18= (筐) The quotient is one digit. 商是一位数。 Close to 20, think of 18 as 20 test quotient. 18接近20，把18看作20试商。 A: on average, each student picked __ baskets. 答:平均每个同学摘了__筐。 How many baskets did each parent pick? 平均每个家长摘了多少筐? Six hundred thirty eight divided by twenty two 638÷22= (筐) The quotient is two digits. 商是两位数。 A: on average, each parent picked ___ baskets. 答:平均每个家长摘了___筐 。 Will you calculate 216÷36 and 806÷44? 你会计算216÷36和806÷44吗?
Related links 相关链接
Fill in first, then observe the data in the form. What do you find? 先填一填，再观察表中的数据，你发现了什么? From left to right, the divisor and the divisor multiply by 2 or multiply by 4... 从左向右看，被除数和除数同时乘2或乘4..... Twelve divided by two is six 12÷2=6 twenty-four divided by four is six 24÷4=6 I found that the business had not changed. 我发现商没有变。 The divisor and the divisor multiply the same number at the same time, and the quotient remains unchanged. 被除数和除数同时乘相同的数，商不变。 The divisor and the divisor are divided by the same number at the same time, and the quotient unchanged. 被除数和除数同时除以相同的数，商不变。 Is this a rule? 这是一个规律吗? We can give a few examples to verify. 我们可以举几个例子验证一下。 If the divisor and divisor multiply by 0..... 如果被除数和除数同时乘0..... The division and divisor multiply or divide by the same number (except 0) at the same time, and the quotient remains unchanged. 被除和除数同时乘或除以相同的数(0除外)，商不变。 |
Powered by Discuz! X3.4
Copyright © 2001-2020, Tencent Cloud.
