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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?​