YOUR TAX-DEDUCTIBLE CONTRIBUTION PURCHASES THIS ITEM FOR OCS - THANK YOU! From measuring cute critters using centimeter rulers to counting angles and sides of 2-D shapeschildren complete 40 different activities to master every Common Core State Standard for second-grade math! Our ready-to-use center comes with enough materials for up to 4 students to work at once, including 4 sets of hands-on materials, plus 40 activity cards that are each aligned to a specific standard.