This pack aims to aid second grade teachers in aligning math time to common core standards in a fun and meaningful way. These pages are wonderful for independent practice, reviews, homework, and check-ins. The following concepts are covered:• Mental math: 3 versions are included. 10 more/10 less, 100 more/100 less, and 10 more/10 less and 100 more/100 less• Skip counting by 2’s, 5’s, and 10’s• Two digit subtraction• Three digit subtraction• Subtraction using a number line• Two digit mixed additi