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Authoritative PPT Summary
"Mixed Operation" PPT
Part One: Learning Objectives
1. Be able to perform three-digit addition and subtraction operations with three-digit numbers.
2. Ability to use knowledge of addition and subtraction to solve practical problems
Scenario import
Big frog: eats 150 mosquitoes
Small frogs: eat 30 fewer frogs than big frogs
Tadpole Brother: Ate 60 mosquito larvae
Brother Tadpole: Eats 30 more tadpoles than Brother Tadpole
What questions can you ask based on the above information?
1. How many mosquitoes did the little frog eat?
2. How many mosquitoes does Brother Tadpole dare to call?
3. How many mosquitoes did the two frogs eat in total?
4. Did the two tadpoles eat a total of human mosquito larvae?
Mixed operations PPT, part 2: detailed explanation of classic questions
1. How many mosquitoes did the two eat in total?
First, count the number of frogs eaten: 150-30=120 (only)
Then calculate how many frogs the two frogs eat in total: 120+150=270 (only)
List the comprehensive calculation formula:
150-30+150=270 (only)
What should we think about first according to the problem? What else?
Mixed operations PPT, part 3: error-prone tips
What is the order of operations for continuous addition, continuous subtraction, and mixed addition and subtraction calculations?
Calculated in order from left to right
What is the order of operations for equations with parentheses?
You need to calculate what’s inside the parentheses first.
Keywords: Free download of Hebei Education Edition second-grade mathematics PPT courseware, mixed operation PPT download, .PPT format;
For more information about the PPT courseware "Mixed Operations Three-digit Addition and Subtraction Three-digit Numbers" PPT courseware, please click the Mixed Operations PPT Three-digit Addition and Subtraction Three-digit Numbers PPT tag.
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