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This Addition Within 20 drill has 40 problems for Grade 1. Football theme. Answer key included.
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Max must collect all the footballs scattered across the field before the big game starts!
Standard: CCSS.MATH.1.OA.C.6
Preview
Page 1 — Drill
Page 2 — Answer Key
What's Included
About this Grade 1 Addition Within 20 Drill
Addition within 20 is a cornerstone skill for first graders because it bridges concrete counting to abstract number relationships. At ages 6 and 7, children's brains are ready to move beyond counting on fingers and begin recognizing number patterns and relationships. When your child masters addition within 20, they develop mental math flexibility—the ability to break numbers apart and recombine them in different ways. This skill directly supports reading, telling time, managing money, and solving everyday problems like figuring out how many crayons they have when combining two boxes. Students who build strong addition-within-20 fluency enter second grade with confidence and are better equipped to tackle two-digit addition and word problems. Most importantly, this practice builds number sense—an intuitive feel for quantity and relationships—that becomes the foundation for all future mathematics learning.
What your student will practice
- Solve addition problems with sums up to 20 using multiple strategies
- Recognize and apply commutative property (3+5 equals 5+3)
- Use visual models, number lines, and manipulatives to represent addition
- Build automaticity and quick recall of addition facts within 20
Common mistakes to watch for
Many first graders recount from 1 instead of counting on from the larger number—for example, solving 14+3 by recounting 1,2,3...14,15,16,17 rather than starting at 14 and counting up three more. Other students lose track of their count, especially with larger addends, leading to incorrect sums like saying 12+5=16. Some children also confuse addition with subtraction, particularly when word problems mention both concepts in the same lesson. Watch for hesitation, finger counting on every problem, or answers that jump by more or fewer than the second number—these signals mean your student needs more practice with the strategy, not just the drill.
Create a simple addition game using household items—try arranging toy cars, blocks, or even snacks into two small groups and asking your child to find the total. Start with sums under 10, then gradually work up to 20. For example, place 8 crackers in one pile and 4 in another, then ask 'How many crackers altogether?' Let your child physically move and count the items, then gradually encourage them to solve it mentally. Repeat this weekly with different quantities, and you'll see their confidence and speed grow naturally. This playful, hands-on approach mirrors what happens in the classroom and makes addition feel purposeful rather than like a drill.