2 Answers
The denominators must be the same when you add or subtract fractions. 3/5 and 9/10 have different denominators (5 and 10). When that happens, you must find the lowest common multiple of both denominators. In other words, what is the smallest number of which BOTH 5 and 10 are factors. Let's think really hard. 1 x 10 = 10 5 x 2 = 10. Let's use 10 as the denominator!!!! (EZ)
Since multiply /5 x 2 to get to 10, you must also multiply the numerator (3) by 2 also; this keeps your fraction 3/5 equal. 6/10 is the same as 3/5. You multiply 10 by 1 to get 10, so you multiply 9 by 1 also. 9/10
Now you have 6/10 and 9/10. (Think of two pizzas, cut into 10 pieces each. You have 6 pieces of one left and 9 pieces of the other. How many total pieces of pizza do you have). 6/10 + 9/10 = 15/10 When the numerator is larger than the denominator, you have what is called an "improper fraction". FIX IT:
1. Divide the numerator (15) by the denominator (10). You will get 1.5 or 1/5/10 or 1 1/2
13 years ago. Rating: 0 | |