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TEACHER-GUIDE-VERIFIED · TG-V9-010

7. A magnetic index changes from +18 to -7. Find the signed change and its magnitude.

Verified solution

Solution: Change = final - initial = -7 - 18 = -25. The magnitude of the change is 25 index units.

Source: Teacher Guide V9 · English V9. Match the numbers and wording in your printed question before using this solution.

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VIDEO HELP · TG-V9-010

Signed Change vs. Magnitude | From +18 to −7 (TG-V9-010)

Use the number line to follow a magnetic index from +18 to −7, calculate the signed change of −25 index units, and distinguish it from its magnitude, 25 index units.

Space Math Explorers · approved worked example · 2:30 · Watch on YouTube

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These pages reproduce verified solution steps for the registered V9 questions. It does not diagnose learning needs or replace instruction from a qualified teacher or tutor.