Exploring Numbers Author:Leo Brueckner Elda Merton Foster Grossnickle Vintage School Textbook for math. I'm guessing it is about a 4th grade level. Includes: multiplying by 2 place numbers, first steps in division, adding subracting like fractions, more difficult division with 2 place numbers, graphs, areas, adding and subracting unlike fractions and denominate numbers, decimals to hundredths