Add/subtract within 20 & missing addend Worksheets
Add/subtract within 20 & missing addend is a math readiness skill. We have 2 worksheet families that practice it, each generated fresh for your child on the theme they love.
Typical age: 6-7 (grade 1) · sample sheets for ages 5–7.
Built for this skill
Add & Subtract to 20
BrainRotU turns grade-1 addition and subtraction facts into a themed equation sheet — the child solves each problem and WRITES the answer, with picture support for Kindergarten and numeral-only missing-addend reasoning for first grade (CCSS 1.OA).
Story Problems
BrainRotU writes a playful, personalized story problem starring your child and their favorite theme — then asks them to solve it and write the answer. The numbers and the answer are fixed by BrainRotU so the math is always correct; only the story is themed (CCSS 1.OA word problems within 20).
More math skills
Print this one, personalized for your kid
Tell us your child's age and what they love. We generate the worksheet tuned to them — you print it and sit down together with a pencil.
3 free worksheets, no card · then a 30-day free trial · $10/mo after · cancel anytime, effective at the end of your billing period.