Question

what is 2 3/5- 1 3/8=

Answer 1

2 3/5- 1 3/8

Find the common denominator which is 40.

Multiply by 8 for 2 3/5

3*8= 24

5*8= 40

Multiply by 5 for 1 3/8

3*5= 15

8*5= 40

2 24/40-1 15/40= 1 9/40

Answer:1 9/40

Answer 2

For this case we must find the value of the following expression:

$2 \frac {3} {5} -1 \frac {3} {8}$

We have to:

$2 \frac {3} {5} = \frac {5 * 2 + 3} {5} = \frac {10 + 3} {5} = \frac {13} {5}\\1 \frac {3} {8} = \frac {8 * 1 + 3} {8} = \frac {8 + 3} {8} = \frac {11} {8}$

Rewriting the expression we have:

$\frac {13} {5} - \frac {11} {8} = \frac {8 * 13-5 * 11} {5 * 8} = \frac {104-55} {40} = \frac {49 } {40}$

Answer:

$\frac {49} {40} = 1 \frac {9} {40}$