This is a Boom Deck, please scroll down if you're not a member of Boom Learning and aren't familiar with Boom Decks. These 16 Boom cards will allow students to practice finding the missing numbers on number lines. This deck contains 1 unknown under 10. Check out the preview for a sample of the deck and my store for many more decks! I'm all for sharing, but please purchase the multiple licenses as Boom Learning takes out fees every time the item is downloaded. Thank you so much!! This is a great