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Author:
Anonymous
ID:
304133
Filename:
Flashcards
Updated:
2015-06-17 00:30:21
Tags:
adding subtracting multiplying division
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Description:
solving math problems using various methods
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  1. How do you add decimals?
    Always line up the decimals vertically. Place a zero behind each whole number to keep track of what is being added.

    • ex: 12.30
    •       10.00
    •       22.30
  2. How do you add fractions?
    Every fraction must have a common denominator. To find the lowest common denominator, simply multiply the denominators. Remember what you do to the denominator must be done to the numerator. If you multiply the denominator by 3 the same has to be done to the numerator. Each side will be multiplied by the opposite number.
  3. How do you add percents?
    Simply turn the percentage into a decimal and add. Remember to line up the decimal points.
  4. How do you subtract math problems with decimals?
    Line up the decimals points and subtract like any other basic subtraction problem. Remember to add a zero behind each whole number to keep everything lined up.
  5. How do you subtract math problems with percentages?
    Simply turn the percentage into a decimal and subtract. Remember to line up the decimal points to keep the numbers organized.
  6. How do you subtract math problems with fractions?
    You must first find the lowest common denominator by multiplying the denominators. Once that is done, simply subtract straight across. If the problem is a mixed fraction, it must be converted into an improper fraction first.
  7. How do you perform multiplication?
    Multiplication is the fast way of adding. It is taking one number and adding it to itself as many times as is asked.

    ex: 5x6=30 (5+5+5+5+5+5=30)
  8. How do you multiply math problems that have decimals?
    Perform the multiplication as usual. Once you have the answer, simply count the numbers behind the decimals in the original problem and count them off from right to left. 

    • ex: 150.20
    •             x3
    •       450.60
  9. How do you do multiply percentages?
    Turn the percentage into a decimal and multiply. Remember to count the numbers behind all of the decimals then place the decimal. Always count from right to left when placing decimals.
  10. How do you divide fractions in math problems?
    When dividing fractions, the rule is you flip the second fraction and multiply straight across.

    • ex: 1/2x2/3=
    •       1/2x3/2=3/4
  11. How do you divide percentages in math problems?
    Simply turn the percentage into a decimal and divide. Remember dividing is figuring out how many times a number will go into another number.

    ex: 40% is .40 divided by 10=0.4
  12. How do you divide math problems that have decimals?
    These problems will be set up in long division form. The decimal will be moved to the right side of the divider and will also be moved as many times in the number to be divided. Remember to place the decimal on the division line directly above the decimal in the problem. This way you will have accurate placement and can figure out the right answer.

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