Your students will love practicing their mental addition and subtraction of 10 and 100 with fun, engaging BOOM™ cards! A variety of cards are included to give students practice adding and subtracting mentally. This deck includes 30 cards perfect for practicing 2nd grade math standard 2.NBT.8. BOOM™ cards are self-checking task cards that provide immediate student feedback. BOOM cards can be used on interactive white boards, desktops, chrome books, laptops, iPads, iPhones, Kindle Fire, and more!