First Grade Mathematics Standard: Add within 100, including adding a two-digit number and a one-digit number and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method, and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten. Write the standard in student-friendly terms. Break the standard down into measurable parts and present those parts in a sensible sequence. o Knowledge objectives (what the student should know) o Skill objectives (what the students should be able to do) Identify the prerequisite knowledge and skills students need before mastery of the identified standard can be obtained