Question

what is 3 1/2 - 2 7/8=

Answer 1

Step-by-step explanation:

$= 3 \frac{1}{2} - 2 \frac{7}{8}$

$= \frac{3 \times 2 + 1}{2} - \frac{2 \times 8 + 7}{8}$

$= \frac{7}{2} - \frac{23}{8}$

Now...find the lcm...

$= \frac{7}{2} \times \frac{4}{4} - \frac{23}{8} \times \frac{1}{1}$

$= \frac{28}{8} - \frac{23}{8}$

$= \frac{28 - 23}{8}$

$= \frac{5}{8}$

Answer 2

Answer:

5/8

Step-by-step explanation:

3 + 1/2 - 2 - 7/8

⇒ 3 - 2 = 1

1/2 - 7/8 = ?

⇒ 4/8 - 7/8 = -3/8

1 - 3/8 = 5/8

Alternative approach:

7/2 - 23/8(converted mixed numbers to fractions)

(7 × 8) - (23 × 2) ÷ 2 × 8

= 56 - 46 ÷ 16

= 10/16

= 5/8