Koplow Games Inc KOP18207 16mm Subtraction dice set in white color features -1 through -6 numbers for practicing subtraction. Provides fun for kids with effective learning. Comes in set of 10 for kids to learn math and improve their knowledge. Suitable t. - Subtraction dice set perfect for learning centers or group activities. - Comes in white color for attractive look. - Measures 16 mm. - Includes 10 pieces for fun way to learn basic math. - Learn to subtract basic -1 through -6 with dice. - Koplow Games Inc Subtraction dice set is perfect to improve the math fluency of your kids. Suitable for the age group of 6 - 9 years/grades kindergarten - 3rd.