Billions

Skills:addition of positive and negative numberssubtraction of positive and negative numbersstrategy

Billions is a board game that builds your understanding of negative numbers.

The Billions board is a grid of numbers with size 5 x 8. Once the game starts, the grid is filled with random positive (blue) and negative (pink) numbers.

How it works

Once you touch a number, the four numbers surrounding it (above, below, right and left) will be "sucked" into the number by addition. The number you touched will change into the sum of the five numbers: the original number you touched and the four numbers surrounding it.

The game won't be cleared. You can just keep increasing your number until you reach 1 trillion, and beyond.

Give it a go!

The game is currently available on Google Play, and is free from any ads.