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Authoritative PPT Summary
"Today I am in charge" PPT courseware 5
1. Situation introduction
Rice 4.72 yuan per kilogram
Xiaomi costs 5.28 yuan per kilogram
Buy 2.5kg each of rice and millet
How much does it cost in total?
What mathematical information do you know from the picture?
What questions can you ask based on this information?
2. Cooperation and exploration
How much does it cost in total?
Rice 4.72 yuan per kilogram
Xiaomi costs 5.28 yuan per kilogram
Buy 2.5kg each
Can you use comprehensive calculations to solve the problem?
give it a try
Use a simple method to calculate the following questions and explain what arithmetic laws are used?
①12.25＋36＋7.75 ②1.25×1.68×8
=12.25+7.75+36 =(1.25×8)×1.68
＝20＋36 ＝10×1.68
=56 =16.8
Commutative law of addition, associative law Commutative law of multiplication, associative law
③19.7×5.3＋4.7×19.7 ④10.1×87
=19.7×(5.3+4.7) =(10+0.1)×87
＝19.7×10 ＝10×87＋0.1×87
=197 =870+8.7
Distributive law of multiplication = 878.7
distributive law of multiplication
3. Independent practice
1. Fill in the blanks.
(1)1.25×7.7×8= × ×7.7
(2)6.1×5.4+3.9×5.4=(+)×5.4
(3)2.5×(10+4)= × + ×
(4)13×10.1=13×( + )= × + ×
2. Use simple methods to calculate the following questions.
①0.25×368×40 ②1.7×101
③7.8×9＋7.8 ④19.7×5.3+4.7×19.7
3. A certain school held a theatrical performance to celebrate "Teacher's Day" and made 36 sets of chorus costumes and 14 sets of dance costumes. If an average of 1.8 meters of fabric is used per set, how many meters of fabric are needed in total?
1.8×36＋1.8×14
= 1.8×(36+14)
= 1.8×50
= 90(meter)
Answer: A total of 90 meters of fabric are needed.
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