Answer Key — 1.NBT.C.4

For parents and tutors

Do not share with students before practice tests.

Practice Problems — Sets 1–10

| Set | Guidance | | --- | --- | | Set 1 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 2 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 3 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 4 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 5 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 6 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 7 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 8 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 9 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 10 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. |

Practice Problems — Sets 11–20

| Set | Guidance | | --- | --- | | Set 11 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 12 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 13 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 14 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 15 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 16 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 17 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 18 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 19 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. | | Set 20 | Add within 100, including adding a two-digit number and a one-digit n… — verify written work and accept reasonable drawings. |

Review tiers 1–10

Checklists are parent-judged.
Written items: verify against practice set patterns.
Standard text: Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used. Understand that in adding two-digit numbers, one adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.

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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