Use these teaching slides to teach the steps to subtraction. The first ten problems should be used for guided instruction. You guide the students through every problem speaking out loud as you work out each problem with them. The second set of 10 problems should be used for..”Do you understand it?” Call on students to come up and work the problem out. They must be able to tell what they are doing and why they are doing it. The 3rd set of problems should be assigned to students for them to work on them independently. Be available to answer any questions that they may have. The rest of the problems can be used to reteach and or practice the skill. There are 52 problems in this set 1, and 60 Problems in set 2. Students cannot complete subtraction word problems, or division problems if they do not know their facts and or the steps to take when adding.
CCSS.Math.Content.1.NBT.C.6 Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), 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.
CCSS.Math.Content.1.OA.B.4 Understand subtraction as an unknown addend problem. For example, subtract 10 – 8 by finding the number that makes 10. CCSS.Math.Content.1.OA.D.7 Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false. For example, which of the following equations are true and which are false? 6 = 6, 7 = 8 – 1, 5 + 2 = 2 + 5, 4 + 1 = 5 + 2