Usborne First Numbers Flashcards are a great way to help your child learn about numbers. 42 of the cards show numerals or number words on one side and a picture on the reverse. Seven cards show mathematical symbols, and one card suggests ways to use the cards at home or in the classroom. This box contains 50 cards: 0-zero, 1-one, 2-two, 3-three, 4-four, 5-five, 6-six, 7-seven, 8-eight, 9-nine, 10-ten, 11-eleven, 12-twelve, 13-thirteen, 14-fourteen, 15-fifteen, 16-sixteen, 17-seventeen, 18-eighteen, 19-nineteen, 20-twenty, one card of notes, 1/4, 1/2, 1/3, +, -, X, =.