Students use the strategy of a number line provided on each card as they find 10 more or 10 less and add or subtract 10 from 2-digit numbers. There are 5 Boom Cards with numbers from 101-120, but you can easily "HIDE" those cards in your Boom Cards Library by selection "ACTION" and "HIDE CARDS". ❤️ Students type the sum or difference on each card. ✅ 30 Cards are self-checking and shuffle each time the deck is played. ✅ An interactive game for iPad, computer, SmartBoard, or projector. ❤️ Ho