I LOVE this–I suck at math, so Zachie and MacLean know better than to even ask me anymore. (Editor’s note: I actually had to call my engineer brother to get an answer for fourth grade math. THAT’S how much I suck.) iTunes is offering “Math Farm” free for a limited time. It’s a fun little interactive game that teaches addition, subtraction, multiplication and division. It’s good for your iPhone or iPad. Download it free by clicking here.