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:
 
 As your answer "have a 3 in the tenths column" we have then:
 
 Clearing x we have:
 
 
 Anita divided between the following multiple number of 10:
 x = 100

Iagree that is the answer to the question