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Page 114 - 120. When we subtract rational numbers we are finding the difference between those two number on a number line. For example we need to look.

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Presentation on theme: "Page 114 - 120. When we subtract rational numbers we are finding the difference between those two number on a number line. For example we need to look."— Presentation transcript:

1 Page 114 - 120

2 When we subtract rational numbers we are finding the difference between those two number on a number line. For example we need to look at how far we go from -6 to get to 4. Because we move to the right on the number line the distance is positive!

3 We can use this strategy: We can Add the opposite of the decimal! -2.3 – (-3.9) = = -2.3 + (+3.9) = -2.3 + 3.9 = 1.6

4 Similar steps to adding fractions.Find the lowest common denominator. Change both fractions to equivalent fractions.Add the numerators. X 3 X 2

5 Strategy – change the Mixed Number to an IMPROPER fraction and follow from there.

6 Page 119-121 #4, 5 all, 7bdf, 9f, 10, 11, 13cd, 15abc

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8 Strategy ONE- is to place the number being subtracted on a number line and follow from there Strategy TWO – is to change the Mixed Number to an IMPROPER fraction and follow from there.

9 It is important to remember that when we are subtracting rational numbers to use equivalent fractions. These are numbers that have the same number of pieces. Think ½ and 1/8 - in order to make them equivalent they both must be out of 8ths is And 1/2 is the same as 4/8 so:

10 Math Makes Sense – SEE IT ( link page 115)


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