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For

Ex.: 2/5 + 1/5 = 3/5

For

Ex.: 1/2 + 3/4

The LCM of 2 and 4 is 4.

Therefore, we'll have 4 (LCD) as the denominator and 2 as the numerator.

Do the same with the other fraction. But in this case, the LCD and the denominator of the other fraction (3/4) are just the same, all we have to do is simply copy it. Then add.

1/2 ⇒ 2/4

3/4 ⇒ 3/4

Now, we have them as similar fractions. Simply add them.

2/4 + 3/4 = 5/4 ⇒ 1 1/4 (5/4 is an improper fraction, we need, I guess, convert the improper fraction to a Mixed number.)

Same as

If we have

Ex.: 5/6 - 1/6 = 4/6 ⇒ 2/3 (lower term of 4/6 is 2/3, we need to reduce the fraction into the lowest term, always remember that).

And for

Ex.: 7/8 - 1/4

LCD - 8

7/8 ⇒ 7/8

1/4 ⇒ 2/8

7/8 - 2/8 = 5/8

In case you have encountered

5 1/6 - 2 5/6

We cannot subtract this - 1 - 5, so we have to borrow.

(Sorry I'll just use this for simpler explanation)

We can simply

(5 × 6) + 1 = 30 + 1 = 31 ⇒ new numerator

(2 × 6) + 5 = 12 + 5 = 17 ⇒ new numerator

5 1/6 ⇒ 31/6

2 5/6 ⇒ 17/6

Now, subtract.

31/6 - 17/6 = 14/6 or 2 2/6 or 2 1/3