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1) You can divide to find equal parts of a whole and equal groups.(Foresman, Scott, et. al, pp. 302,308)
2) Multiply the divisor by as many 10's as necessary until we get a whole number. Remember to multiply the dividend by the same number of 10's.
Then you divide like you normally would.

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1) You round decimals  because your real answer to the problem will be close to the answer you got when you rounded the decimals and it makes it easier to get close to the answer faster.

2) To round Decimals; Look at the place value that you're rounding to then look at the digit to the right of the number you're rounding to. If the number to the right of what you'rerounding to is 4 or smaller than the number your rounding to stays the same but if the number is 5 or higher you round the number up.

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1) You convert decimals to fractions to see the fraction amount.

2) Write down the decimals divided by 1.Multiply both top and bottom by 10 for every number after the decimal point.Simplify the fraction.

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1) You do it to find the product of a decimal number and a power of 10. (Foresman, Scott, et. al, p.165)
2) Multiply without the decimal points. Then put the decimal point in the answer. Then put the decimal point in the answer . It will have as many decimal places as the two original numbers combined.

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Adding/Subtracting

Rounding decimals

Multiply decimals

Multiply decimals, pic

Convert decimals to fractions

Convert decimals to fractions/pic

Dividing Decimals

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1) To find out which number is larger and which number is smaller.
2) You line up the numbers by their decimals so you can compare numbers with the same place values. You move from left to right until you find a difference in the numbers.

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Sal orders 5 decimals from least to greatest.

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If you want to know if you have enough moy or not to buy something.
Line up the decimal points. Add/subtract whole numbers from right to left. Then you put the decimal point in the answer in line below the decimal points in the numbers being added/subtracted.