Observed addition and related subtraction recall

This Grade 1 worksheet practices observed addition and related subtraction recall (Common Core 2.OA.B.2; Alberta Number 2).

A separately selected teacher-led activity. Read the materials, procedure and marking rule in the teacher key before teaching.

1 grid · answer key on the last page · each version has different numbers · Print from the browser

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On this sheet

  • What are the answers to the number facts your teacher asks? — answer: 3 + 5 = 8; 8 − 3 = 5; 9 + 8 = 17; 17 − 9 = 8; 10 + 9 = 19; 19 − 10 = 9; 10 + 10 = 20; 20 − 10 = 10. Record each answer, recalled/calculated/not observed, and prompts. Correct calculations do not establish recall. This sample does not certify the entire fact range.

Questions teachers ask

How many problems are on this worksheet?
1 on one page, with the answer key on the last page.
What grade and standard is it for?
Grade 1. Common Core: 2.OA.B.2. Alberta: Number 2.
Can I print more than one version?
Yes. Every version has different numbers and its own answer key. Use “Make another version” for a new one; the same version always prints the same.

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Observed addition and related subtraction recall · AXIS