Question

Find (a) 2/3 + 5/7 (b) 4/5 - 2/3

Answer 1

Answer:

a) 29/21 b/ 2/15

Step-by-step explanation:

a) ⅔ + ⁵/7

LCM = 3 × 7 = 21

(14 + 15)/21 = 29/21

b) ⅘ - ⅔

LCM = 5 × 3 = 15

(12 - 10)/15 = 2/15

Answer 2

Answer:

(a) 29/21 or 1  8/21 (b) 2/15

Step-by-step explanation

1. You first find the common denominator (bottom number)  

To find this you find the LCM (lowest common multiple).

For example, 15 is the LCM of 3 and 5.

2. You do what you have done with the denominator to the numerator ( top number).

For example, I multiple 5 by 3 to get 15 this means i multiple 2 by 5 to give you 10

At this stage your fractions for b are meant to look as follows:

12/15 - 10/15

3. The last is you simply subtract or add.