grade 1 · WN-001

Find the unknown in a story

Represent adding to, putting together, taking from, and comparing with an unknown in different positions.

Learn togetherFresh problem · seed 1063576527

7 birds were in a tree. Some more arrived, and then there were 18. How many arrived?

Let's work it out together.

Work through one checkpoint at a time. Your answer area opens after the reasoning.

Checkpoint 1

Name what is known at the start, what changes, and the result.
Checkpoint 2

Put the unknown in the matching box.
Checkpoint 3

Use addition or its related subtraction fact.

Your answer