Summit Addition Mastery

Item 6: Multiple Choice Rounding Solution (3 pts) Correct: Choice C

Correct Option C: 189,450 rounds to 190,000 (thousands digit 9 ≥ 5). 214,800 rounds to 210,000 (thousands digit 4 < 5). 190,000 + 210,000 = 400,000.

Distractor Analysis: Option A rounds 189,450 down erroneously to 180,000; Option B shows 400,000 which is the correct sum but Choice C gives 190,000 + 220,000 = 410,000. (Award 3 pts for C; 0 pts for distractors).

Summit Survey • Teacher Answer Key Page 1 of 2

Teacher Answer Key • Part II

Sections 3 & 4: Word Problems & Reasoning

Section 3: Multistep Word Problem Solutions

8 Points Total (4 pts each)

Item 7: Alpine Expedition Cargo (Two-Step Problem) Answer: 36,240 pounds

Step 1: Base Camp Beta (2 pts)

  14,875 (Alpha)
+  6,490 (more)
= 21,365 pounds

1 pt for setup; 1 pt for accurate sum.

Step 2: Total Combined (2 pts)

  14,875 (Alpha)
+ 21,365 (Beta)
= 36,240 pounds

1 pt for adding both camps; 1 pt for final answer with units.

Critical Teacher Alert: A frequent mistake is stopping after Step 1 and reporting 21,365 lbs. If student correctly finds 21,365 but fails to perform Step 2, award 2 out of 4 points.

Item 8: Three-Month Trail Counter Answer: 388,265 visitors

Standard Algorithm Setup:

1  1  2  1   
  128,450 (June)
  142,875 (July)
+ 116,940 (August)
388,265 visitors

Point Breakdown:

• 2 pts: Correct place value alignment & carrying across columns (notice sum of hundreds: 4+8+9+1=22, regroup 2 thousands).

• 1 pt: Computation accuracy (388,265).

• 1 pt: Clear units/label ("visitors" or "hikers").

Section 4: Error Analysis & Reasoning Solutions

5 Points Total

Item 9: Maya's Regrouping Error Solution Correct Sum: 73,322

Part A Explanation (3 pts):

Exemplar response: Maya made multiple regrouping errors: In the tens column, 1 + 2 + 9 = 12 tens; she wrote 1 instead of 2 and forgot to regroup the 1 hundred. In the thousands column, she did not add the regrouped thousand from 8+4, or she added 5+7=12 without regrouping to the ten-thousands column correctly.

Award 3 pts for clearly identifying that Maya missed regrouped digits or recorded digits in the wrong place value; 2 pts for partial explanation; 1 pt for vague answer.

Part B Correct Solution (2 pts):

1  1  1  1   
  45,827
+ 27,495
73,322

Full credit (2 pts) for 73,322.

Next Steps & Targeted Intervention:

• Regrouping Struggles (Items 1-4, 9): Use base-ten blocks or place value disk mats to reinforce trading 10 of a smaller unit for 1 of the next unit left.

• Word Problem Struggles (Items 7-8): Practice tape diagrams / bar models to help students visualize two-step comparisons before calculating.

Summit Survey • Teacher Answer Key Page 2 of 2

Progress Monitoring Action Plan & Re-Test Protocol: Intervention Window: 2 Weeks (8 sessions x 15 mins)

Tier 2 Small Group Roster:

Tier 1 Intensive 1-on-1:

Target Re-Assessment Date:

Goal: 80%+ mastery across all domains

Summit Survey • Progress-Monitoring Recording Sheet Grade 4 Addition Assessment Suite