Black-white gap minimal and non-significant on FDS at ages 7 and 9. Black-white gap larger and significant on FDS at age 11. Black-white BDS gap substantially larger than FDS gap at all ages and highly significant. White-Hispanic gaps substantial and significant on both tests across ages. BDS gap half size of FDS gap for whites vs Hispanics at ages 9 and 11. Hispanics outscore blacks on BDS at every age. Blacks outscore Hispanics on FDS at every age. Digit span requires only numbers 1-9 knowledge. FDS tests simple memory storage and recall. BDS adds mental manipulation of information. Black FDS strength challenges info exposure explanation for IQ gaps. BDS higher g-loading than FDS for whites and blacks. FDS higher g-loading than BDS for Hispanics. Blacks show strong short-term memory relative to low g. Hispanics show weak short-term memory relative to g. Native American ancestry likely causes Hispanic FDS weakness.