![]() ![]() And as you play, the cost of the crystals (and other things) starts to increase, but so does your production. There are several sections of the world to unlock: the first requires 6 crystals, then 5 crystals, and so on. If you’re subtracting and you need to “borrow” the 1 from the next column, the app shows you what’s going on conceptually by having you open up a bag of 10 apples. (If you wait too long or give the wrong answer enough times, the app will prompt you with hints.) When you get 10 of something, you’ll bundle those up into a batch, like a bag of apples or coins-and so on. Eventually you’ll be adding and subtracting numbers with several digits.Īs you play, the addition and subtraction problems will take on other forms: sometimes you drag and drop the objects, and sometimes you’ll just get numbers, and you write the answers yourself. Collect those, and you get some more addition problems-and you’ll find that there are other Nooms out there who need rocks. Fill in the shape with crystals, and it unlocks another section of the world: now you can sell apples for gold coins, or spend them to get into the rock quarry, where you tap on big boulders to break them into small rocks. Well, there’s an eggplant character in another part of the world who also wants apples-and he’ll turn them into crystals. (Spoiler: it’s another apple tree.) But what do you do with all these apples, anyway? The world is waiting to be completed. If you give him the apples, he starts digging away-and when the countdown finishes, he’s got a big present. Meanwhile, there’s a grey Noom standing near the apple tree, and he’s asking for 5 apples. You drag all the apples down to the sum section-once they’re all there, the “window” closes and the app lets you trace the number “7” to finish it up. In the screen above, I had four apples and I picked 3 more. When you pick the apples, they go up to your inventory-but they don’t get added to your total until you tap them, at which point you get to add up the apples. The app starts off pretty simply: there’s a tree, and apples are growing (rather rapidly) on it. For teachers, there’s a version that will allow you to give access to your students- click here for more about DragonBox EDU. It’s $7.99, and is available from the Apple App Store, Google Play Store, and Amazon. The latest release is Big Numbers, and it’s a sort of world-building game that brings in the Nooms (from the Numbers app) and gives them various places to work and play. Since then, there have been a few other apps, teaching geometry and simple number skills. In case you’re new to DragonBox, it’s a company from Norway that burst onto the scene a few years ago with an app that teaches algebra in a truly innovative way-I still recommend it as one of the best math-based apps I’ve ever seen. DragonBox is back with a new app to get your kids hooked on addition and subtraction: Big Numbers. ![]()
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