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"Interconversion of Percents, Decimals and Fractions" Understanding Percents PPT Courseware 2
1. Read each percentage below.
16% 72.5% 180% 49.072%
2. What would it be if each of the following numbers were expanded 100 times? How does the decimal point move? What would they look like if they were shrunk 100 times? How does the decimal point move?
2.5 5 0.48 1.25 10.3
In production and life, when making statistics and comparisons, it is often necessary to convert decimals or fractions into percentages, or convert percentages into decimals or fractions.
If the denominator is 10, 100, 1000, etc., you can directly remove the denominator and see how many zeros there are after 1 in the denominator. Then count the number to the left from the last digit in the numerator and click on the decimal point.
If the denominator is not 10, 100, 1000... to convert a decimal into a fraction, the denominator must be used to remove the numerator; if it cannot be divided, you can keep as many decimals as necessary by rounding.
Determine what is right or wrong and correct the wrong question.
4. 6%= 460 (X) 4.6%=0.046
0.5%= 0.0 5 (X) 0.5%=0.005
1=100%(V)
55%=55 (X) 55%=0.55
judge:
1. 0.6%=0.6 ( )
2. Add "%" after 30, and the resulting number will be 100 times larger than the original number. ( )
3. 15.5% expanded 10 times is 155. ( )
4. To convert a decimal into a percentage, just move the decimal point two places to the right and add a percent sign at the end. ( )
Expand your thinking
1. Fill in the blanks: ( ): 16 = 0.125 = 1÷ ( ) = ( )%.
2. The ratio of girls to boys is 4:5. Girls are less than boys ( ), and girls are less than boys ( )%.
3. The number of girls in a class of six years is 1.2 times that of boys, and there are ( )% more girls than boys.
Homework:
1. The number of cows is 25% more than the number of sheep. How many percent fewer sheep are there than cows?
2. 100 increases by 10% and then decreases by 10% ( ).
3. The price of a schoolbag is 25% lower this year than last year, and 20% lower than the year before last year. How much lower is the price this year than the year before?
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"Interconversion of Percents, Decimals, and Fractions" PPT courseware for understanding percentages:
"Interconversion of Percents, Decimals, and Fractions" PPT courseware for understanding percentages. First convert the following decimals into fractions, and then talk about the method of converting fractions into decimals. First convert them into fractions whose denominators are 10, 100, and 1000, and then reduce them. To convert a decimal into a percentage, just put the decimal point...