Ready, set, hop! /
Murphy, Stuart J.,1942-
Buller, Jon,1943-illustrator.
New York : HarperCollins,
[2016?], ©1996.
Explains equation building as two frogs count their hops to a rock, a log, and a pond.
"Level 3, Building equations"
"Ages 7 up"--Back cover.
Explains equation building as two frogs count their hops to a rock, a log, and a pond.
Addition
Subtraction