The Penny Pot

by Stuart J. Murphy

Published 8 August 1998
The face painting booth at the school fair provides plenty of opportunities to count combinations of coins adding up to fifty.

Dinosaur Deals

by Stuart J. Murphy and Heather Henson

Published 21 August 2001
Lets Make a Deal! Mike and his little brother, Andy, are headed for the Dinosaur Card Trading Fair. They're ready to wheel and deal. It's, 4 Stegosaurus for 1 Triceratops, and 2 Triceratops for 1 Allosaurus. But can they get what they really want: the tremendous, gigantic, ferocious, Tyrannosaurus rex? The math concept of equivalency -- understanding when values are equal -- is introduced in this fast-paced story as two brothers try to beat the clock and make the ultimate trade.

Safari Park

by Stuart J. Murphy

Published 1 December 2001
It's 4 tickets for the Treetop Coaster! Just 2 for the Elephant Twirl! five cousins each have 20 tickets to spend at Safari, and a little algebra will tell them how many rides they can try. But who will dare the death-defying Terrible Tarantula?

Betcha! Estimating

by Stuart J. Murphy

Published 5 October 1999