Rainy Day Addition Printable (1st Grade) - TeacherVision All Kinds of Weather; Winter; Women in STEM; Holidays. Asian American and Pacific Islander Heritage Month; ... WORKSHEETS. Two-Digit Addition by 10s. Find the sum in the two-digit vertical addition problems featured on this printable math worksheet. Project-Based Learning. No prep, ready-to-teach PBL for science, math, ELA, and social studies ...