Powerful visualizations for meaningful, connected learning Spaced repetition takes advantage of cutting-edge science of memory Extra games and explorations included to deepen learning Three decks with three different visualizations of multiplication, for a total of 162 cards. Deck 1: Dots in circles. 1 × 1 through 5 × 5 (25 cards total) Deck 2: Arrays. 1 × 1 through 10 × 10 (100 cards total) Deck 3: Prime factor circles. Products from 4 to 100. (37 cards total) Multiplication by Heart is a deeper, more connected, more visual way to learn. We take advantage of the science of memory to make sure you're getting the facts down, accurately and quickly. And you understand what the equations mean visually, as well as how to get the right answer. Plus, there are games, puzzles, and explorations to take the learning further, all while having fun! Contains 3 decks, each featuring a different visualization of multiplication. Deck 1: 25 cards based on the "equal groups of" visualization. Deck 2: 100 cards based on the array visualization. Deck 3: 37 cards based on visualizing prime factors. Total: 162 cards.