Anita divides 1438 by a multiple of 10. Her answer has a 3 in the tenths column. what number did she divide by?

 For this case, the first thing we are going to do is define a variable.
 We have then:
 x: unknown number and multiplo of 10
 We then have the following number:
 1438
 Dividing between the unknown number we have:
 [tex]1438 / x [/tex]
 As your answer "have a 3 in the tenths column" we have then:
 [tex]1438 / x = 14.38 [/tex]
 Clearing x we have:
 [tex]x = 1438 / 14.38 x = 100[/tex]
 Answer:
 Anita divided between the following multiple number of 10:
 x = 100