# Cross Over: A game for practicing addition and subtraction

Hello all!

I’d like to share another strategic game from BEAM called Cross Over.

Players start on opposite sides of the hexagonal game board and roll a regular 6-sided die, then choose whether to add the number shown or to subtract it, moving only to touching spaces.

The goal of the game is to land on the opposing player’s start space.

As the days become warmer and drier here I am imagining a version of this game played outside on an interlocking brick driveway or a drawn with … you guessed it… sidewalk chalk. :o) But perhaps that’s a bit ambitious.

Regardless of how you choose to play, students working on mastering addition and subtraction will enjoy Cross Over, and the combination of strategy and luck will ensure that even older children and parents will find the game accessible and fun.

Enjoy!

Carole

# Deep Sea Duel – A mental math and logic game for all

I discovered this engaging game a week or so ago and wanted to share. It’s called** Deep Sea Duel.** In the game, you match wits with the computer in the form of an octopus called Okta. (She’s the same character as in the iPad game called **Pick-a-Path**, below). When you square off against Okta, you can choose the level of difficulty and her level of “nastiness”. Good thing too. It took me a while to sort out a strategy for winning when things were too easy, and I had to crank up the nastiness in order to really understand the game and its complexity. The thing that I hadn’t considered was that Okta could win with **ANY** of her 3 (4) cards – not just the first 3 – if that makes any sense. 😛

The goal of the game is to reach a target number by adding a set of cards together. You and Okta take turns. As you play, keep track of both your score and Okta’s to be able to block her attempts to collect three (or 4) cards with the specified total before you can! There’s a ton of mental math going on in this game – and, if you’re up for it, you can move into decimal numbers too…!!

Enjoy…! More games and links like these can be found on the NCTM Illuminations webpage.

Carole