Adding Rationals
2/5+4/5
6/5=1 1/5
4-2
2
5*8
40
-86/(-14)=
0.1904
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1234+1234
2468
5-4
1
12*12
50/100
0.5 or 0.50
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-10.20+20.47
10.27
4/5-)-3(/5)
1/5
10/5
2
5/5
1
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rules for adding rationals
To add or subtract rational expressions with unlike denominators, first find the LCM of the denominator.
9.99-(-9.98)
0.01
6/7*-6/7=
12/7
100/10
10
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39+(-20.4)=
18.6
Rules for subtracting rationals
To add or subtract rational expressions with unlike denominators, first find the LCM of the denominator
rules for multiplying and dividing rationals
Multiply rational expressions. You multiply rational expressions in the same way as you multiply fractions of rational numbers. In other words you multiply the numerators with each other and the denominators with each other.
34/12
2 10/12 or 1 and 2 5/6
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