Contributor(s):Author: Maria Miller Math Mammoth Grade 1-B is the student worktext for the second half of grade 1 mathematics studies, as part of the Math Mammoth Grade 1 curriculum. It covers addition and subtraction facts within 10, measuring, geometry, addition and subtraction with two-digit numbers, and counting coins. Please note that this particular book is the version with grayscale (or black-and-white) interior pages.