II. Estimate and solve the problem. 1. Nithan has 13 pencils in his pencil case. About how many pencils are there in all if Nithan has 26 pencil cases? 2. Jeff's marbles are about three times as many as John's. John's marbles are as many as Nathanieľs marbles. Nathaniel has 126 marbles. About how many marbles does Jeff have?