Answer Key — 1.OA.D.8
For parents and tutors
Do not share with students before practice tests.
Practice Problems — Sets 1–10
| Set | Guidance | | --- | --- | | Set 1 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 2 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 3 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 4 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 5 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 6 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 7 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 8 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 9 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 10 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. |
Practice Problems — Sets 11–20
| Set | Guidance | | --- | --- | | Set 11 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 12 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 13 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 14 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 15 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 16 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 17 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 18 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 19 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. | | Set 20 | Determine the unknown whole number in an addition or subtraction equa… — verify written work and accept reasonable drawings. |
Review tiers 1–10
- Checklists are parent-judged.
- Written items: verify against practice set patterns.
- Standard text: Determine the unknown whole number in an addition or subtraction equation relating three whole numbers. For example, determine the unknown number that makes the equation true in each of the equations 8 + ? = 11, 5 = _ - 3, 6 + 6 = _.
Practice test scoring
| Tier | Pass guidance | | --- | --- | | 1–3 | Most oral tasks smooth; majority of written correct | | 4–6 | 7/10+ total with clear understanding | | 7–8 | 9/12+ with explanations | | 9–10 | Near-perfect; ready to move on |
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