2.OA.2: Fluently Add and Subtract Within 20

1. Fact Family Triangles

Draw triangles with three numbers showing related addition and subtraction facts (e.g., 8, 5, 13 shows 8+5=13, 5+8=13, 13-8=5, 13-5=8).

2. Ten Frames

Use ten frames to visualize numbers and quickly recognize combinations that make 10, helping with strategies like "make a ten."

3. Number Bonds

Draw circles connected by lines showing how numbers can be broken apart and put together (e.g., 12 can be 8+4, 7+5, 6+6).

4. Double Facts Chart

Create a visual chart showing doubles (1+1, 2+2, etc.) and doubles plus one (3+4, 5+6, etc.) to help memorize these patterns.

1. Math Card Games

Play games like "Make 10" or "Make 20" where players combine cards to reach target sums, or "Difference of 5" where they find pairs with a difference of 5.

2. Mental Math Challenges

During daily activities, pose quick mental math problems: "If you have 12 crayons and give me 5, how many do you have left?" or "You have 8 stickers and I give you 7 more, how many now?"

3. Dice Addition/Subtraction

Roll two dice and practice adding or subtracting the numbers quickly. For more challenge, use three dice or create target numbers.

4. Counting Collections

Count small collections of items (buttons, coins, etc.) and practice adding or subtracting small amounts without recounting the entire collection.

1. Use the "Make 10" Strategy

Teach your child to make combinations of 10 first, then add the rest. For example, 8 + 5 = 8 + 2 + 3 = 10 + 3 = 13.

2. Practice Doubles

Memorize doubles (1+1, 2+2, etc.) as these are usually easier to remember, then use "doubles plus one" for nearby facts (7+8 is 7+7+1).

3. Count On From Larger Number

For addition, start with the larger number and count on. For 5+9, start with 9 and count on 5 more.

4. Use Fact Families

Practice related facts together (6+7=13, 7+6=13, 13-7=6, 13-6=7) to strengthen understanding of the relationship between addition and subtraction.

5. Break Into Smaller Steps

Break harder facts into easier ones. For 9+6, think 9+1=10, then 10+5=15.

Activity 1: Fact Family Flash

Write three numbers that form a fact family (e.g., 7, 8, 15). Have your child quickly say all four related facts.

Activity 2: Beat the Clock

Create a set of 20 basic addition and subtraction facts. Time your child as they solve them, trying to beat their previous time.

Activity 3: Missing Number

Practice equations with missing numbers: 7 + ___ = 12 or 14 - ___ = 8.

Activity 4: Fact Triangles

Create triangular flashcards with three numbers. Cover one number and have your child determine the covered number using addition or subtraction.