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Topic 7

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eli figueiredo

on 11 March 2015

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Transcript of Topic 7

Topic 7
By: Eli, Dominick,
and Alison

How to Divide Decimals

Rule: There are more than one type of dividing decimals. One type is if both the divisor and dividend have a decimal then you would just bring the decimal in the dividend up. One other type is when only the dividend has a decimal and its the exact process of when both has decimals. One last type is when the divisor has a decimal and then you would count the number of digits after the decimal and then that digit is the number of zeros you put after the dividend and then you divide.
How to Divide

Rule: You put the divisor outside the line and the dividend inside the line.Then you times the divisor by the biggest number, but it can't be bigger than the dividend. Then you subtract the number that was timed by the divisor by the dividend. Then that number is a remainder and you put a R and that number by the other number and that is called a quotient.

How to Add Decimals

Rule: First step, you line up your decimal. Second step, you put zeros in any empty space in your problem. Third step, you now add all the numerals and bring the decimal down.

How to Subtract Decimals

Rule: First step you line up your decimal. Second step you put zeros in any empty space in your problem. Third step you now subtract all of it and bring the decimal down.


How to Multiply Decimals

Rule: You would multiply just like you do normally. Then you add like normal. After that you count how many digits are after the factors decimals. Then you count backwards in the answer and put the decimal there. If you are multiplying money then if there are more than two digits after the decimal them you round to the nearest penny.

Decimals and Fractions

Rule: If you want to change a decimal to a fraction you count how many digits are after the decimal and that number is the number of zeros you put in the denominator. 10, 100, 1000 etc. If you want to change a fraction to a decimal you divide the numerator by the denominator . If you can simplify, you simplify by dividing both the numerator and denominator by the same number until you cant divide anymore.

Comparing Fractions and Decimals
Rule: If they are all decimals than you see which one is bigger or smaller. If they are all fractions and they don't have the same denominator then you change one of the denominators to the other one by dividing the fraction and then multiplying back up. If one is a fraction and one is a decimal then you change the decimal into a fraction or the fraction into a decimal and then just see which one is bigger or smaller.

Fractions and Decimal Problem Solving

Rule: First you read the problem very carefully. Then you do what it tells you, figure it out the best you can and then check your work.
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