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    Second Grade
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    Scoring guide · Weeks 13–18 · 40–45 min · 54 points

    Math Unit 3 Test: Operations & Algebraic Thinking

    Directions for the grown-up

    Give this test on a calm day, after the unit's last lesson. Sit with your child and read the directions for each part aloud. Read any item aloud if your child asks. Reading is not what this test checks. Do not time the test. The time given is only a guide, so you can plan. Take a short break between parts if your child is tired. Do not teach or hint during the test. If your child is stuck, say "Do your best, then we can move on." When you score, use the answer and the partial-credit notes for each part. Then add the points and find the level at the end. Your child may use the tools from the lessons: counters or beans for pairing and arrays, bar models and drawings. For Fluency Within 20, the goal is quick recall, but do not time it. If your child counts on fingers for many facts, give the points for correct answers and note which facts were slow; those are the ones to practice.

    Part 1: Fluency Within 20 (20 points)

    Standards: 2.OA.B.2

    1. 7 + 8 = ____Answer: 15 · 1 point
    2. 6 + 9 = ____Answer: 15 · 1 point
    3. 8 + 8 = ____Answer: 16 · 1 point
    4. 7 + 6 = ____Answer: 13 · 1 point
    5. 9 + 3 = ____Answer: 12 · 1 point
    6. 8 + 6 = ____Answer: 14 · 1 point
    7. 4 + 9 = ____Answer: 13 · 1 point
    8. 5 + 6 = ____Answer: 11 · 1 point
    9. 3 + 8 = ____Answer: 11 · 1 point
    10. 2 + 9 = ____Answer: 11 · 1 point
    11. 15 − 8 = ____Answer: 7 · 1 point
    12. 11 − 4 = ____Answer: 7 · 1 point
    13. 17 − 9 = ____Answer: 8 · 1 point
    14. 12 − 3 = ____Answer: 9 · 1 point
    15. 13 − 5 = ____Answer: 8 · 1 point
    16. 14 − 8 = ____Answer: 6 · 1 point
    17. 11 − 9 = ____Answer: 2 · 1 point
    18. 14 − 9 = ____Answer: 5 · 1 point
    19. 15 − 6 = ____Answer: 9 · 1 point
    20. 12 − 8 = ____Answer: 4 · 1 point

    Scoring: 1 point for each correct answer. There is no partial credit on single facts.

    Reteach: Week 15Week 15 Days 1–3 (doubles and near doubles, make a ten, and thinking addition to subtract).

    Part 2: Word Problems (1- and 2-step) (18 points)

    Standards: 2.OA.A.1

    1. Some birds were in a tree. 15 more birds came. Now there are 33 birds. How many birds were in the tree at first?Answer: 18 birds (? + 15 = 33) · 3 points
    2. Omar had 54 stickers. He gave away 18 stickers. How many stickers does he have left?Answer: 36 stickers (54 − 18 = ?) · 3 points
    3. Lena has 51 shells. Kai has 27 shells. How many fewer shells does Kai have than Lena?Answer: 24 fewer shells (51 − 27 = ?) · 3 points
    4. There are 63 books on two shelves. 24 books are on the top shelf. How many books are on the bottom shelf?Answer: 39 books (24 + ? = 63) · 3 points
    5. Ivy has 34 marbles. Ben has 12 more marbles than Ivy. How many marbles do they have together?Answer: 80 marbles (34 + 12 = 46; 34 + 46 = 80) · 3 points
    6. A bus had 46 people on it. At the first stop, 19 people got off and 23 people got on. How many people are on the bus now?Answer: 50 people (46 − 19 = 27; 27 + 23 = 50) · 3 points

    Scoring: One-step problems (1–4): 1 point for a bar model or equation that fits the story, 1 point for the correct number, 1 point for a label word. Two-step problems (5–6): 1 point for each correct step and 1 point for the final answer with a label. A common mistake on item 5 is answering 46 (Ben's marbles only); that earns 1 point.

    Reteach: Week 13, Week 14, Week 16Week 13 Days 1–4 (adding stories and where the ? goes), Week 14 Days 1–4 (take-away and compare stories) and Week 16 Days 1–3 (two-step stories).

    Part 3: Odd & Even (8 points)

    Standards: 2.OA.C.3

    1. Is the number odd or even? (a) 19 (b) 12Answer: (a) odd (b) even · 2 points
    2. Write each even number as the sum of two equal numbers. (a) 16 = ____ + ____ (b) 14 = ____ + ____Answer: (a) 8 + 8 (b) 7 + 7 · 2 points
    3. Draw 11 dots in pairs. Is 11 odd or even? How do you know?Answer: Odd. Look for: 5 pairs and 1 dot left over. · 2 points
    4. Two sisters want to share 15 grapes fairly, with none left over. Can they? Why?Answer: No. 15 is odd, so 1 grape is left over (7 + 7 = 14). · 2 points

    Scoring: Items 1–2: 1 point for each part. Items 3–4: 1 point for the right answer and 1 point for a reason (pairs with one left over, or no two equal numbers make it).

    Reteach: Week 17Week 17 Days 1–4 (pairing, the ones digit, equal addends and fair sharing).

    Part 4: Arrays & Repeated Addition (8 points)

    Standards: 2.OA.C.4

    1. An array has 3 rows with 4 stars in each row. Write a repeated addition equation. How many stars?Answer: 4 + 4 + 4 = 12; 12 stars · 2 points
    2. Draw an array with 2 rows and 5 columns. Write the equation. How many in all?Answer: 5 + 5 = 10; 10 in all · 2 points
    3. An array has 4 rows with 3 dots in each row. Write one equation for the rows and one for the columns.Answer: Rows: 3 + 3 + 3 + 3 = 12. Columns: 4 + 4 + 4 = 12. · 2 points
    4. A muffin tray has 4 rows. Each row has 5 muffins. How many muffins? Write the equation.Answer: 5 + 5 + 5 + 5 = 20; 20 muffins · 2 points

    Scoring: 1 point for a correct drawing or equation and 1 point for the correct total. For item 3, give 1 point for each correct equation.

    Reteach: Week 18Week 18 Days 1–4 (rows and columns, adding by rows, adding by columns, and array stories).

    D/A/P/E point bands (out of 54)
    LevelPoints
    D · Developing0–26
    A · Approaching27–37
    P · Proficient38–48
    E · Exemplary49–54