2020 Arkansas Teacher of the Year, Joel Lookadoo, shows students ways to better understand math. In this episode, Joel teaches students to compare equations by using number lines and tens sticks. He encourages students to visually represent the equations to have a better understanding of how the equations compare. Accompanying this video is a worksheet that provides students the opportunity to practice comparing equations.
2020 Arkansas Teach of the year, Joel Lookadoo, uses models and drawings as well as written expressions to help students add two-digit numbers. Mr. Lookadoo discusses ways to decompose, or break down, numbers to make the addition easier for students. The “Show What You Know” handout gives students a chance to practice the methods Mr. Lookadoo uses.
In Module 4, Topic A, students build upon their understanding of the base ten system and their prior knowledge of place value strategies presented in Module 3. In Lesson 1, students relate 10 more and 10 less and 1 more and 1 less to addition and subtraction. They recognize that they must add and subtract like units and that the digit in the tens place changes when adding and subtracting 10, just as the digit in the ones place changes when adding or subtracting 1. Students see numbers in terms of place value units; 54 – 10 is 5 tens 4 ones minus 1 ten. They learn to record the addition and subtraction of multiples of 10 using arrow notation. In Lesson 2, students apply place value understanding to add and subtract multiples of 10 before counting on by tens. For example, when adding 20 to 43, they may count 53, 63. Students also develop flexibility in using related addition problems. For example, to solve 92 – 60, one student might think 9 tens – 6 tens is 3 tens, plus 2 is 32, while another starts at 60, adds on 3 tens, and then 2 ones to reach 92, so 32.
In this interactive activity, students will be led through strategies to use the properties of addition (commutative, identity, and associative properties) to solve addition problems. There are teaching activities as well as practice activities available. A handout that reviews the three properties of addition can be printed. Although students in this grade level are not required to recall the specific names of the properties, understanding these concepts can assist students in their ability to fluently add within 100 using strategies based on the properties of operations.
There is a karaoke song with printed lyrics that will help students learn and remember the properties of addition. After utilizing this resource, the students can complete the short quiz to assess their understanding.
