Teach place value the fun way with math center activities. These games focus on the numbers 10-99, perfect for 1st grade. Skills include tens and ones, base-10 models, expanded form, number words, and decomposing numbers. Common Core skills addressed are 1.NBT.B.2, 1.NBT.B.2.A, 1.NBT.B.2.B, 1.NBT.B.2.C