Question

Help on this please!

Answer 1

$\frac{2}{9}$ - $\frac{7}{12}$
Make the two fractions have common denominators. 9 and 12 both fit into 36, so multiply the top and bottom of $\frac{2}{9}$ by 4 and $\frac{7}{12}$ by 3.

$\frac{2}{9}$ ⇒ $\frac{8}{36}$
$\frac{7}{12}$ ⇒ $\frac{21}{36}$

Now that both fractions have common denominators, you can subtract them easily. Subtract the numerators (8 - 21) and keep the denominators the same.

$\frac{8}{36}$ - $\frac{21}{36}$ = $\frac{-13}{36}$

a = -13
b = 36