Does your child struggle to remember subtraction facts — or have they memorized them without really understanding what subtraction means? Most flash cards just drill the same facts over and over until kids either get it or give up. Subtraction by Heart from Math for Love takes a completely different approach. Instead of rote repetition, your child works through three distinct visual representations of subtraction that build genuine number sense alongside speed and accuracy. They don't just learn the answers — they understand why the answers are true. The spaced repetition practice system is based on cutting-edge memory science: short, targeted sessions that space out review at exactly the right intervals so facts actually stick. Just five minutes a day is enough to build real fluency. What's included: —145 cards across 3 decks, each with a different visualization of subtraction —A structured spaced repetition practice system —Bonus games, puzzles, and explorations for kids who want to go deeper —Clear parent and teacher guidance for getting started Designed for ages 5–9 and grades K–3. Works beautifully for homeschool families, classroom teachers, tutors, and parents doing kitchen-table math. Makes an excellent gift for any child building foundational math skills. From the creators of Prime Climb, Tiny Polka Dot, and the Math for Love curriculum — math education designed around wonder, understanding, and the belief that every kid can love math. Don't learn by rote. Learn by Heart.