# Math Help - units converts

1. ## units converts

convert to cubic feet:

64.2 inches x 30.0 inches x 26.0 inches

2. Originally Posted by tangerine_tomato
convert to cubic feet:

64.2 inches x 30.0 inches x 26.0 inches
Multiply each term by $\frac{1~ft}{12~in}$

Then when you multiply everything together, the units will be in $ft^3$

--Chris

3. Originally Posted by tangerine_tomato
convert to cubic feet:

64.2 inches x 30.0 inches x 26.0 inches
Originally Posted by Chris L T521
Multiply each term by $\frac{1~ft}{12~in}$

Then when you multiply everything together, the units will be in $ft^3$

--Chris
u can do that $\frac{64.2in}{1} *\frac{1ft}{12in}$ and that would cancel inches out blah blah....then repeaton on other 2 dimensions then multiply to geth ur answer in feet cubed

however this may also help u in the future $\frac{1ft^3}{1}*\frac{12in}{1ft}*\frac{12in}{1ft}* \frac{12in}{1ft}$thus canceling feet cubed so you now have $1ft^3= 1728in^3$

thus $64.2in*30.0in*26.0in =50076in^3 * \frac{1ft^3}{1728in^3}$giving you $28.979...ft^3$

we can check your answer by doing the above method chris showed (probobly safer but much much slower.....(as u can record how man inches cubed are in a feet for future use)

so $\frac{64.2in}{1}\frac{1ft}{12in}=5.35ft$

$\frac{30in}{1}\frac{1ft}{12in}=2.5ft$

$\frac{26in}{1}\frac{1ft}{12in}=2.1111...ft$

and finaly

$5.35ft*2.5ft*2.1111..ft=28.979...ft^3$

hope that gives u help in the future..shortcuts are always nice(just can get messy if u make mistakes)