(LCM) for the denominators. Because you have to make the denominators the same before you add the fractions, find a common multiple that they share. Then choose the lowest one. For example, for 9/5 + 14/7, the multiples of 5 are 5, 10, 15, 20, 25, 30, and 35 while the multiples of 7 are 7, 14, 21, 28, and 35. 35 is the least common multiple. You'll need to multiply the entire fraction to make the denominator become the least common multiple. For example, multiply 9/5 by 7 to get a denominator of 35. You should also multiply the numerator by 7, so the fraction becomes 63/35. Remember that when you adjust 1 fraction in your problem, you also have to adjust the other fractions so they're equivalent. For example, if you've adjusted 9/5 to 63/35, multiply 14/7 by 5 to get 70/35. Your original problem 9/5 + 14/7 will turn into 63/35 + 70/35. Once all of the denominators in your problem are the same, add the numerators. Put the answer over the denominator. For example, 63 + 70 = 133. Place it over the denominator to get 133/35. If your answer is improper, turn the fraction into a mixed number. To do this, divide the numerator by the denominator so you get a whole number. Then see how many parts are left and place this number over the denominator. Reduce the fraction if it can be simplified further. For example, 133/35 can be simplified to 3 28/35. The fraction can be reduced to 4/5 so the finished answer is 3 4/5.
أوجد المضاعف المشترك الأصغر (م.م.أ) للمقامات. اضرب كلًا من البسط والمقام لجعل المقامات متماثلة. حوِّل الكسور الأخرى لكسور مكافئة. اجمع البسطين، لكن اترك المقام الموحد في الكسرين كما هما دون تغيير. بسّط الناتج إذا لزم الأمر.