8. 18.72 Tenths

Neighbor is:

≈

9. 2.95 Tenths

Neighbor is:

≈

10. 73.41 Tenths

Neighbor is:

≈

11. 0.65 Tenths

Neighbor is:

≈

12. 61.04 Tenths

Neighbor is:

≈

E Part E: Word Problem Rhythm

13. Track Meet: Leo ran the 100-meter sprint in 12.48 seconds. Round his official race time to the nearest tenth of a second.

Show thinking & answer:

14. Farm Stand: A pumpkin weighs 15.74 pounds. The farmer charges based on the nearest whole pound. What weight should the farmer use?

Show thinking & answer:

F Part F: Error Analysis • Spot the Slip

15. Detective Challenge: Maya rounded 8.37 to the nearest tenth and got 8.3. She says, "I looked at the 3 and let it rest." What mistake did Maya make? What is the correct rounded number?

Completed practice sheet • Turn in for teacher review Total: / 20 pts

Challenge students with chained rounding questions: "Find the smallest and largest 2-decimal numbers that round to 45.6." (Answer: 45.55 to 45.64).

Decimal Rounding Rhythm • Page 1: Instructional Framework See Page 2 for Complete Answer Keys →

Master Answer Key All Student Materials

Worked Solutions & Scoring Rubrics

Answer Key

A-B Worksheet Page 1: Do Now & Guided Model Key

Part A: Do Now

• 1. "5 or more, raise the score; 4 or less, let it rest."
• 2. Target whole number: 7; Neighbor next door: 3.
• 3. Neighbor is 8 → Raise the score (+1) (8 ≥ 5).
• 4. Neighbor is 2 → Let it rest (keep) (2 ≤ 4).

Part B: Guided Table

• • 36.72 → Neighbor: 7 | Raise | 37
• • 54.29 → Neighbor: 2 | Rest | 54
• • 8.46 → Neighbor: 6 | Raise | 8.5
• • 19.83 → Neighbor: 3 | Rest | 19.8

C-D Worksheet Page 2: Independent Practice Key

Part C: Nearest Whole Number

1. 14.7 → 15 (n=7)

2. 32.3 → 32 (n=3)

3. 9.5 → 10 (n=5)

4. 68.19 → 68 (n=1)

5. 125.8 → 126 (n=8)

6. 40.48 → 40 (n=4)

Part D: Nearest Tenth

7. 5.38 → 5.4 (n=8)

8. 18.72 → 18.7 (n=2)

9. 2.95 → 3.0 (n=5)

10. 73.41 → 73.4 (n=1)

11. 0.65 → 0.7 (n=5)

12. 61.04 → 61.0 (n=4)

E-F Worksheet Page 2: Applications & Error Analysis Key

13. Track Meet (12.48 sec to nearest tenth): Answer: 12.5 seconds

Target is 4 (tenths), neighbor is 8 (hundredths). Since 8 ≥ 5, raise the score: 4 becomes 5.

14. Farm Stand (15.74 lbs to nearest whole pound): Answer: 16 pounds

Target is 5 (ones), neighbor is 7 (tenths). Since 7 ≥ 5, raise the score: 15 becomes 16.

15. Error Analysis (Maya rounding 8.37 to tenths): Correct Answer: 8.4

Maya's Error: Maya looked at the target digit (3) instead of looking next door at the neighbor (7). Because the neighbor is 7 (which is 5 or more), she needed to raise the score (+1) to make 8.4 instead of letting it rest at 8.3.

ET Exit Ticket Answer Key & Misconception Prompt Rubric

Part 1 Rhyme: raise / let it rest

Q1 (17.62 → whole): Neighbor is 6 → 18

Q2 (43.28 → whole): Neighbor is 2 → 43

Q3 (8.45 → tenth): Neighbor is 5 → 8.5

Q4 (62.71 → tenth): Neighbor is 1 → 62.7

Part 4 Misconception Prompt (Marcus / 7.48):
Marcus is incorrect. In decimal rounding, you only look at the one neighbor immediately to the right of the target place. When rounding 7.48 to the nearest whole number, the target is 7 (ones) and the neighbor is 4 (tenths). Because 4 is "4 or less", we let it rest! We do not round the 4 first using the 8. The correct rounded whole number is 7.

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