Adding and Subtracting Decimals
Follow these rules <ul><li>   Find the decimal </li></ul><ul><li>Line up decimals </li></ul><ul><li>Fill in empty spots w...
Let’s try some!!! <ul><li>56.78 + 1.3 = z </li></ul><ul><li>58.08 = z </li></ul><ul><li>56.78 </li></ul><ul><li>+1.30   </...
<ul><li>45.6 – 3.784 = z </li></ul><ul><li>41.816 = z </li></ul><ul><li>(Don’t forget to line up decimals) </li></ul><ul><...
<ul><li>45.8 + 23 = z </li></ul><ul><li>68.8 = z </li></ul><ul><li>OH!!  We need to find the decimals!!!!! </li></ul><ul><...
<ul><li>78 – 3.567 = z </li></ul><ul><li>74.433 = z </li></ul><ul><li>OH!!!!  We need a decimal for the 78. </li></ul><ul>...
Don’t forget integers rules!! <ul><li>Addition Rules </li></ul><ul><li>If signs are the SAME, </li></ul><ul><li>ADD and ke...
<ul><li>-89.23 + 132. 8 = z </li></ul><ul><li>43.57 = z </li></ul><ul><li>Should we add or subtract? </li></ul><ul><li>Sub...
<ul><li>-89.45 – 34 = z  (need to add opposite) </li></ul><ul><li>-89.45 + (-34) = z </li></ul><ul><li>-123.45 = z </li></...
<ul><li>56.23 – (-34.2) + 45.365 – 100 = z </li></ul><ul><li>( 56.23 + 34.2 )  + 45.365 + (-100) = z  (add Opposite) </li>...
Now It’s your turn!!! <ul><li>Good luck with your assignment. </li></ul><ul><li>Be sure to complete all problems.  </li></...
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Add and Subtract Deciamls

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Add and Subtract Deciamls

  1. 1. Adding and Subtracting Decimals
  2. 2. Follow these rules <ul><li> Find the decimal </li></ul><ul><li>Line up decimals </li></ul><ul><li>Fill in empty spots with zeros </li></ul><ul><li>Add or Subtract </li></ul><ul><li>It’s that easy!!!!!!! </li></ul>
  3. 3. Let’s try some!!! <ul><li>56.78 + 1.3 = z </li></ul><ul><li>58.08 = z </li></ul><ul><li>56.78 </li></ul><ul><li>+1.30 </li></ul><ul><li>58.08 </li></ul>
  4. 4. <ul><li>45.6 – 3.784 = z </li></ul><ul><li>41.816 = z </li></ul><ul><li>(Don’t forget to line up decimals) </li></ul><ul><li>That’s the rule!!!! </li></ul><ul><li>45.600 </li></ul><ul><li>-3.784 (Don’t forget to borrow) </li></ul><ul><li>41.816 </li></ul>
  5. 5. <ul><li>45.8 + 23 = z </li></ul><ul><li>68.8 = z </li></ul><ul><li>OH!! We need to find the decimals!!!!! </li></ul><ul><li>The 23 needs a decimal. </li></ul><ul><li>It is located behind the 3 (23.) </li></ul><ul><li>45.8 </li></ul><ul><li>+23.0 </li></ul><ul><li>68.8 </li></ul>
  6. 6. <ul><li>78 – 3.567 = z </li></ul><ul><li>74.433 = z </li></ul><ul><li>OH!!!! We need a decimal for the 78. </li></ul><ul><li>Don’t forget, it is located behind the last digit (78.) </li></ul><ul><li>Line up decimals, fill in with zeros and subtract. </li></ul><ul><li>78.000 </li></ul><ul><li>-3.567 </li></ul><ul><li>74.433 </li></ul>
  7. 7. Don’t forget integers rules!! <ul><li>Addition Rules </li></ul><ul><li>If signs are the SAME, </li></ul><ul><li>ADD and keep the sign. </li></ul><ul><li>If the signs are DIFFERENT, </li></ul><ul><li>SUBTRACT and keep sign of larger absolute value. </li></ul><ul><li>Subtraction Rule </li></ul><ul><li>ADD opposite, then use addition rules </li></ul>
  8. 8. <ul><li>-89.23 + 132. 8 = z </li></ul><ul><li>43.57 = z </li></ul><ul><li>Should we add or subtract? </li></ul><ul><li>Subtract, because the signs are different. </li></ul><ul><li>132.80 (put it first because it has the larger absolute value) </li></ul><ul><li>-89.23 </li></ul><ul><li>43.57 (answer will be positive) </li></ul>
  9. 9. <ul><li>-89.45 – 34 = z (need to add opposite) </li></ul><ul><li>-89.45 + (-34) = z </li></ul><ul><li>-123.45 = z </li></ul><ul><li>Should we add or subtract? </li></ul><ul><li>(Add, because the signs are the same) </li></ul><ul><li>(OH!!!! Where is the decimal in the 34? We need it!!!!) </li></ul><ul><li>89.45 </li></ul><ul><li>+ 34.00 </li></ul><ul><li>123.45 </li></ul><ul><li>This answer will be negative, because both decimals are negative. </li></ul>
  10. 10. <ul><li>56.23 – (-34.2) + 45.365 – 100 = z </li></ul><ul><li>( 56.23 + 34.2 ) + 45.365 + (-100) = z (add Opposite) </li></ul><ul><li>( 90.43 + 45.365 ) + (-100) = z </li></ul><ul><li>( 135.795 + (-100) ) = z </li></ul><ul><li>35.795 = z </li></ul><ul><li>56.23 90.430 135.795 </li></ul><ul><li>+34.20 +45.365 - 100.000 </li></ul><ul><li>90.43 135.795 35.795 </li></ul>
  11. 11. Now It’s your turn!!! <ul><li>Good luck with your assignment. </li></ul><ul><li>Be sure to complete all problems. </li></ul><ul><li>Please do not use a calculator. </li></ul>

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