Born and Died
The 1900 and 1910 Census indicate how many children were born to each woman and also how many were still living. Using your form, compare the two. For example, in 1900 the woman claimed that she had three children and all three were living. Then in 1910, she claimed that she had three children and two living, Then search for a death certificate for the child between 1900 and 1910. If, however, in the 1900 census, she claimed that she had three children and only two living, she needs to look for a death record between the time she married and 1900. You might not always find a certificate or obituary, but look for death indexes as well.