MathPup Defense Make 10

The Snow Noids are trying to take over MathPup's fort.  Help MathPup fight them off by using the snow cannons and your adding skills.  Don't let them get past MathPup and watch out as on later levels they start bringing shields!

Click on a cannon in front of a Snow Noid to move MathPup over to it.  Then click a number at the bottom of the screen to fire that number at the Noid.  Causing a Noid's amount to make 10 will knock him off the screen.