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This Addition Within 20 drill has 40 problems for Grade 1. Basketball theme. Answer key included.
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Max must score baskets before the final buzzer sounds—solve each addition problem to help him win the championship game!
Standard: CCSS.MATH.1.OA.C.6
Addition within 20 is a cornerstone skill that bridges the gap between counting and true mathematical thinking. At age 6-7, your child's brain is ready to move beyond memorizing numbers and begin combining them—a skill they'll use every single day. Whether they're keeping score in a game like basketball, combining toys, or figuring out how many snacks they have altogether, addition within 20 gives them the confidence to solve real problems independently. Mastering these facts also strengthens working memory and number sense, making larger math concepts accessible later. Most importantly, fluency with numbers 1-20 builds the mental flexibility your child needs to tackle multi-step problems, making math feel doable rather than overwhelming.
The most common error is counting from 1 every time instead of counting on from the larger number. For example, a child asked to solve 8+5 might count "1, 2, 3... 13" instead of starting at 8 and counting up. You'll spot this by watching their fingers—if they're using all their fingers to count from the beginning, they haven't yet internalized counting on. Another frequent pattern is dropping or forgetting the first number entirely when trying to count up. Encouragement to 'start with the bigger number' and regular practice with visual support helps break this habit quickly.
Create a simple addition game using items your child already loves—building blocks, toy cars, or snacks work perfectly. Call out two numbers (like 7 and 4), have them physically group those items together, and count the total. This hands-on experience helps cement the connection between abstract numbers and concrete reality. Rotate who calls out the numbers so your child stays engaged, and celebrate when they spot that 7+4 equals 4+7. Even 5 minutes of play like this, done several times a week, reinforces fluency faster than worksheets alone.