Subtraction within 20 represents taking away, comparing two quantities, or finding an unknown part of a whole, with nonnegative differences from 0 through 20. Learners connect subtraction to addition, use related fact families, and reason with decomposing to make ten, counting back, and representations such as ten-frames, part–part–whole diagrams, and number lines; the scope excludes negative results, larger numbers, and formal multi-digit subtraction algorithms.
Subtraction tells how many are left when some are taken away.
Example: Solve .
You can check with addition: . Therefore, the answer is .
Click a topic below to practice the foundational skills you'll need, learn the steps, or master this skill
Earned ?