**Ballast – addition puzzles**

##### (MathPickle, 2012)

Ballast addition puzzles are great for students learning addition. They are presented with three warships in each puzzle. Two of these can be made to float by balancing the ballast. The remaining warship is impossible to solve. It is doomed to sink. The students must find the warship that will sink – and make the other two float.

Warships are great for the half of the class with too much testosterone, and the exposure to impossible challenges is central to MathPickle’s drive to make classes engaging.

Download the puzzle-sheets here.

The true spirit of delight, the exaltation, the sense of being more than Man, which is the touchstone of the highest excellence, is to be found in mathematics as surely as poetry.

**Bertrand Russell**

**Standards for ****Mathematical Practice**

MathPickle puzzle and game designs engage a wide spectrum of student abilities while targeting the following Standards for Mathematical Practice:

##### MP1 Toughen up!

This is problem solving where our students develop grit and resiliency in the face of nasty, thorny problems. It is the most sought after skill for our students.

##### MP3 Work together!

This is collaborative problem solving in which students discuss their strategies to solve a problem and identify missteps in a failed solution. MathPickle recommends pairing up students for all its puzzles.

##### MP6 Be precise!

This is where our students learn to communicate using precise terminology. MathPickle encourages students not only to use the precise terms of others, but to invent and rigorously define their own terms.

##### MP7 Be observant!

One of the things that the human brain does very well is identify pattern. We sometimes do this too well and identify patterns that don't really exist.