Learning how to solve one- and two-step word problems using addition and subtraction is a second grade, Common Core math skill: 2.OA.1. Below we show two videos that demonstrate each of these standards. Then, we provide a breakdown of the specific steps in the videos to help you teach your class.
Your students should be experienced in solving all types of addition and subtraction problems. Before, “addition” was separate from subtraction and the problems were limited to one-step problems and numbers within 20 (1.OA.1).
After learning these math skills, your students will be able to apply strategies to both one and two-step problems that involve the “four operations (addition, subtraction, multiplication, division).” Additionally, your students will learn how to represent an unknown using a letter (3.OA.8).
Common Core Standard: 2.OA.1 - Use addition and subtraction within 100 to solve one- and two-step word problems
Students who understand this principle can:
2 Videos to Help You Teach Common Core Standard: 2.OA.1
Below we provide and breakdown two videos to help you teach your students this standard.
Video 1: One- and Two-Step Word Problems
This video is aimed at teachers (not students) and breaks down the components of the standard 2.OA.1, offering examples of 1 and 2 step problems.
First, the video introduces the standard and lists the parts related to the standard.
Next, the video gives an example of a 1-step word problem: “James’ class has an ice cream party. He watches his teacher serve 11 ice cream cones. There are 19 students in James’ class. How many more ice cream cones does his teacher need to serve?”
In either the standard equation method or the drawing method, students should get the answer 8, whether through drawing pictures or using mental subtraction skills.
Next, the video shares an example of a 2-step word problem, similar to the first problem: “James’ class has an ice cream party. There are 19 students in James’ class. He watches his teacher make 11 ice cream cones. 3 ice cream cones melt. How many more ice cream cones does his teacher need to make for each student to get an ice cream?”
The video ends by advising teachers to give their students additional word problems to solve. Once students understand how to solve these word problems successfully, you can have them create word problems for their classmates to solve.
Video 2: Adding with Paul and Subtracting Ribbon Lengths
Boddle introduces the mathematical topic before heading into a classroom where we meet a student named Paul.
Some of Paul’s classmates notice his backpack is really heavy, and he shows them what’s inside:
Boddle then asks how many items are in Paul’s backpack. To solve the problem, one must use addition.
Paul has 22 items in his bag. No wonder it’s so heavy!
After, Boddle uses subtraction to solve a math problem involving two rolls of ribbon.
Boddle shows students that the easiest way to solve this problem is by moving the numbers so their place values are lined up in columns.
After the numbers are aligned correctly, Boddle starts by subtracting the numbers in the ones place.
Boddle says goodbye, congratulating the students on a job well done!
Want more practice?
Give your students additional standards-aligned practice with Boddle Learning. Boddle includes questions related to Comparing and Measuring Lengths plus rewarding coins and games for your students to keep them engaged. Click here to sign up for Boddle Learning and create your first assignment today.
*Information on standards is gathered from The New Mexico Public Education Department's New Mexico Instructional Scope for Mathematics and the Common Core website.