## Unit 1: Deepening Addition and Subtraction Fact Strategies

### What will your child learn in Unit 1?

In Unit 1, second graders will review basic fact math strategies and addition and subtraction that they learned in first grade. Addition and subtraction math fact strategies are mental math techniques that provide a bridge from understanding the meaning of addition and subtraction to quickly and accurately recalling addition and subtraction facts. Children go through phases to quickly and accurately recall basic math facts. Unit 1 will primarily focus on different reasoning strategies.

In addition, students will work on problem solving. They will experience different addition and subtraction story types to solve problems. They will approach the problem their own way and will explain their thinking. Students will be expected to explain their thinking using pictures, numbers, or words. The chart below displays the different types of story problems they will solve in Unit 1.

### What math strategies will your child use in Unit 1?

There are a variety of strategies to help solve basic facts. The type of strategy depends on the kind of basic fact problem. The handout below gives an explanation of the different types of basic fact math strategies.

Check out the videos below to see the math strategies in action. Most of the explanations are from students from our district. Thank you to the students for volunteering to explain their thinking!

### How can you support your child at home to reinforce the concepts taught in Unit 1?

There are several ways to have your child practice the math concepts at home. Try the following activities:

• Give your child an addition or subtraction basic fact problem and have them solve it mentally and explain their thinking verbally.
• Give your child a flashcard that contains a subtraction problem. Have your child find an addition flashcard that can be used to solve the subtraction problem.
• Give your child a near-double flashcard (Ex. 6 + 7). Have your child find a doubles flashcard that can be used to solve the near-double problem (Ex. 6 + 6 or 7+7).
• Do a 5-minute drill using selected flashcards that contain related facts. For example, only flash problems that are near-doubles for 5 minutes.
• Play Salute.
• Have your child create a story problem that involves addition or subtraction to solve the problem. Challenge him or her to create different types of story problems.
• Visit the online rekenrek (number rack) to help your child explore and discover a variety of addition and subtraction strategies. Click the “i” on the bottom of the website for instructions on how to use it.