Percent change

ATI TEAS
Math: Numbers and Algebra
Multiple choice
Difficulty 3 of 5

Question

A city bike-share program recorded 2,400 rides in April and 3,000 rides in May. By what percent did the number of rides increase from April to May?

20%✗ Incorrect

Incorrect. This answer divides by the new value instead of the original value.
25%✓ Correct

Correct. Percent change = (new − old) ÷ old × 100 = (3,000 − 2,400) ÷ 2,400 × 100 = 25%.
125%✗ Incorrect

Incorrect. This answer gives the new value as a percent of the old value.
600%✗ Incorrect

Incorrect. This answer gives the raw difference instead of a percent.

Answer

B. 25%

Rationale

Percent change compares the size of the change with the starting amount. Subtract the April count of 2,400 from the May count of 3,000, divide that difference by the April count, and multiply by 100. Dividing by the newer, larger count would understate the increase.

Worked solution: Percent change = (new − old) ÷ old × 100 = (3,000 − 2,400) ÷ 2,400 × 100 = 25%.

RememberPercent change = (new − old) ÷ old × 100; always divide by the original value.

Sources

DOE-HDBK-1014/1-92 U.S. Department of Energy · License: US government work (public domain) · Retrieved November 2, 2026 · Page 78
Guide for the National Institute of Standards and Technology · License: US government work (public domain) · Retrieved November 2, 2026 · Page 32
State Operations Manual Centers for Medicare & Medicaid Services · License: US government work (public domain) · Retrieved November 2, 2026 · Page 401
Lesson 3: Measures of Risk (Source: CDC) Centers for Disease Control and Prevention (CDC) · License: CDC content (credit required) · Retrieved November 2, 2026 · Vaccine efficacy or vaccine effectiveness; EXAMPLE: Calculating Vaccine Effectiveness

Last verified: November 5, 2026 2 independent automated checks Question teas-mna-00013, version 1

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