Subtraction Flashcards will help fast track subtraction skills of numbers to 10, 20 and 100.Contains 162 flashcards that work with Flashbot – a flashcard flipper. Say the answer andplace the card into the Flashbot’s mouth. The answer magically appears below. A perfect way to master essential learning skills.\r\nFlash cards include 3sets:\r\n\r\nSubtracting numbers up to 10 \r\nSubtracting numbers up to 20 \r\nSubtracting numbers up to 100\r\n\r\nAges:5 + years.\r\nFlashbot robot not included.