Horizons Math is a carefully designed curriculum that makes elementary math easy and enjoyable for both parents and students. Each grade consists of two books with 80 full-color lessons each, and a complete daily lesson guide in the Teacher Handbook. Through reasoning, hands-on learning, and memorization exercises, students gain a complete understanding of math concepts. Sixth Grad reviews and builds upon the four basic math operations. New concepts include word numbers through hundred trillion, scientific notations, base 2, and 4 digit by 4 digit multiplication.