| Category | Format | Size |
|---|---|---|
| Qingdao Edition Sixth Grade Mathematics Volume 2 | pptx | 6 MB |
"Happy Farm Tour" PPT Courseware 5
Description
"Happy Farm Tour" PPT Courseware 5
1. Review and sorting out
How to add and subtract integers, decimals, and fractions?
What do their calculation methods have in common?
integer
●Numbers in the same digits must be aligned;
●Count from the lowest position;
●In addition, if the number is over tens, advance the number to the previous digit; in subtraction, if there is not enough to subtract, go back one to the previous digit and make it ten.
decimal
●Numbers in the same digits must be aligned;
●Count from the lowest position;
●Calculate according to the rules of integer addition and subtraction.
Fraction
●Add and subtract fractions with the same denominator, the denominator remains unchanged, and the numerators are added and subtracted;
●To add and subtract fractions with different denominators, first take the common denominator and then calculate;
●As a result, the offer points can be reduced.
2. Discussion and exchange
What is the relationship between the four arithmetic operations?
10+5=15 15-5=10 8×12=96 96÷12=8
9+9+9+9+9+9=9×6=54
Addition of n a’s = a ×n
a+b=c--c-b=a Subtraction is the inverse operation of addition
a×b=c--c÷b=a Division is the inverse operation of multiplication
a+a+a+……+a=a×n Multiplication is a simple operation of addition
3. Application and reflection
1. Vertical calculation.
699-402=297 498÷12=41.5 197+301=498 203×98=19894
2. According to 53×74=3922, directly write the results of the following questions.
53×0.74 = 5.3×0.074 =
39.22÷0.74 = 3922÷7.4 =
3. Calculate the following questions, and do simple calculations if you can.
2000-197 8.8-6.75+9.2-0.25
41×102 0.8×3.6-0.8×0.6
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"Happy Farm Tour" PPT courseware 11:
"Happy Farm Tour" PPT courseware 11 1. Scenario introduction: 30 tons of pomegranates were produced this year, an increase of 25% from last year. How many tons of pomegranates were produced last year? What mathematical information do you know from the picture? What questions can you ask based on this information? 2. Cooperation and exploration Last year...
"Happy Farm Tour" PPT courseware 10:
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"Happy Farm Tour" PPT courseware 9:
"Happy Farm Tour" PPT courseware 9 1. Situation introduction Last year, the number of self-driving tourists was 480. This year, the number of self-driving tourists was 540. How many percent more people did this year than last year? How many percent fewer people traveled by car last year than this year? Last year the number of group tours was 500. This year’s group...
File Info
Update Time: 2024-07-06
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