Transcription of Math Rules Adding Fractions: You can only add fractions ...
1 Math Rules Adding fractions : You can only add fractions with common denominators. Example: 15 + 25 = 35 (the denominator will always stay the same) Adding fractions : If the denominators are not the same, you must find the common denominator by finding the least common multiple (LCM). Example: 37 + 114 = (the common denominator is 14 so in this case 37 must be multiplied by 22 to have a common denominator) 614 + 114 = 714 Then, reduce the fraction: 714 = 12 Subtracting fractions : You can only subtract fractions with common denominators.
2 Example: 89 49 = 49 (the denominator will always stay the same) Subtracting fractions : If the denominators are not the same, you must find the common denominator by finding the least common multiple (LCM). Example: 23 14= (the least common multiple is 12 so that will be the common denominator in this case. You will have to multiply 23 44 14 33) The equation is now: 812 312 = 512 Multiplying fractions : You can multiply both the numerators and denominators, whether they are common or not. Example: 35 14 = 320 Multiplying fractions : If you can, you must reduce.
3 Example: 310 45 = 1250 = 625 Multiplying fractions : Always remember to cross multiply , if it is possible and then reduce. Example: 57 2830 = 57 2830 = 11 46 = 23 dividing with fractions : 1st Step When dividing fractions , always flip the second fraction and then multiply . Example: 46 23 = 46 32 2nd Step Cross multiply (see if there are common multiples). Example: 46 32 = 3rd Step Then multiply . Example: 22 11 = 22 1
