Respuesta :

10 21/40 =
10. 525

The 10 stays 10. 
Divide 21 by 40 = 0.525

To write 10 21/40 as a decimal, we could use the equation 10 + (21 ÷ 40) to find the solution. So, 10 + (21 ÷ 40) (=) 10 + (.525) = 10.525. So, the decimal for 10 21/40 is 10.525.