BELL RINGER 1. 87 – 38 = 2. 398 -235 3. Name three common denominators of 1/3 and 1/2. 4. Mercury is 58 million kilometers from the sun. Earth is 150 million kilometers from the sun. How much farther from the sun is Earth? STANDARD M6N1. M7N1. M8N1. Students will understand the meaning of the four arithmetic operations as related to positive rational numbers and will use these concepts to solve problems. STANDARD M6N1. M7N1. M8N1. Students will understand the meaning of the four arithmetic operations as related to positive rational numbers and will use these concepts to solve problems.