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"Four Mixed Operations with Decimals" PPT courseware
Preview outline:
1. Read the information window on page 45. What math questions can you ask? Can you solve it?
2. Find the average number of immigrants in each phase of the third and fourth phases: how many thousand people? How do you think? How many algorithms are there?
3. Talk about the order of mixed decimal operations with brackets.
Oral arithmetic:
1.3＋5= 8×0.5=
4.7-2.5= 3.6÷0.4=
0.75÷0.3= 40.6÷2=
If a calculation contains two levels of operation, the second level operation must be performed first, and then the first level operation.
1. Fill in the blanks
①The four arithmetic operations of addition, subtraction, multiplication and division are collectively called ( ).
②Addition and subtraction are called level ( ) operations, and multiplication and division are called level ( ) operations.
③In a calculation, if it only contains operations of the same level, it must be calculated from ( ); if it contains two levels of operations, the ( ) level operation must be done first, and then the ( ) level operation must be done; if there are two kinds of parentheses, ( ) must be calculated first ) inside the brackets, then count the inside of the ( ) brackets.
2. Determine right or wrong and explain the reasons.
238.9－18.9÷0.4＝220÷0.4＝55
0.2×(1＋0.4-1+0.4)÷0.16＝0.2×0÷0.16＝0
7.5÷5 × (4.8＋3.2)＝1.5 ×8＝12
3. State the order of operations and calculate the results in parallel.
3.2÷3.2+0.3×0.3
3.2＋3.2－3.2＋3.2
(5.3＋5.3)÷5.3－0.7
4.8÷4.8×(5.1-4.9)-0.2
0.5×[1.5-(0.7+0.8)]
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"Four Mixed Operations with Decimals" PPT courseware 3:
"Mixed Operations on Decimals" PPT Courseware 3 Learning Objectives 1. Knowledge objectives: Combined with specific situations, understand the connection and difference between the mixed operations on decimals and the four mixed operations on integers. 2. Ability goal: Master the order of the four mixed operations of decimals, and be able to perform decimals correctly..
"Four Mixed Operations with Decimals" PPT courseware 2:
"Four Mixed Operations with Decimals" PPT Courseware 2 Vertical calculations to see who is correct and fast. ① 7. 4＋21.72 ② 50.43－25.8 ③ 1.50.8 ④ 0.361.2 The order and method of the four mixed operations of integers: 1. Addition and subtraction are called ( ) operations; multiplication and...