![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
The expression is ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=51d059e5841d4743674458f29cdaf5f4.png\")
Place value chart for 5.8 and 4.2.
\![\"\"](\"http://www.mathskey.com/userfiles/image/Library/Place_Value_Chart.gif\")
| \
\ | \
\
\ | \
\
\ | \
\
5 \ | \
\
8 \ | \
\
\ | \
\
\ | \
| \
\ | \
\
\ | \
\
\ | \
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4 \ | \
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2 \ | \
\
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\
\ | \
Line up the decimal points and draw a line below the numbers.
\![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=fa1b7d7dcb7a36fbc00aa5d56dd22dcf.png\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
First find the sum of the tenths digit.
\The sum of the tenths digit ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=1ce09c7c57c35678c1072277103058f9.png\")
.
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=e04aee35a230f77915f72deb9127118c.png\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step3.JPG\")
Next find the sum of the ones digit.
\The sum of the ones digit ![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=0c873a1fa0de1351161e794da56ea067.png\")
.
![\"\"](\"http://www.mathskey.com/test/fckeditor/editor/plugins/fckeditor_wiris/integration/showimage.php?formula=8fcacde100deff8b6645a473c73402a7.png\")
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
The sum is 10.