This second-grade core learning activity provides students with an opportunity to explore the concept of compensation using both addend's unknown word problems. Compensation is a strategy based on place value. It is the underlying concept behind the "Making it Friendly" addition strategy.
This activity results from the ALEX Resource Development Summit.
This second-grade engagement activity uses Quick Images in a Number Talk format to begin to build a conceptual understanding of compensation, which is the underlying concept behind the "Make it Friendly" addition strategy.
This activity was created as a result of the ALEX Resource Development Summit.
This second-grade activity is designed for students to use the "Make it Friendly" strategy as an efficient computation strategy to solve a word problem. The "Make it Friendly" strategy is a place value strategy based on the underlying concept of compensation. Students are presented with a parallel task, which includes three-word problems that use numbers with varying magnitudes. The students are allowed to solve the problem of their choice.
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.