Math is one of the most heavily tested sections on the HESI A2 - and one of the easiest areas to improve quickly with structured practice.

If you’ve already reviewed the overall structure of the exam in our HESI A2 breakdown guide: https://goodnurse.com/article/241/hesi-a2-breakdown-every-section-explained-2026-complete-guide

This article will go deeper into the math section specifically, with step-by-step explanations and real problem walkthroughs.

The goal is simple: accuracy first, speed second.

What the HESI Math Section Actually Tests

You can expect questions involving:

• Fractions and decimals
• Ratios and proportions
• Percentages
• Conversions (metric & household)
• Time and military time
• Word problems

The key difference between average scorers and high scorers?
Unit awareness and structured setup.

Printable HESI Conversion Table (Keep This Handy)

Metric Conversions

• 1 kg = 1000 g
• 1 g = 1000 mg
• 1 mg = 1000 mcg
• 1 L = 1000 mL

Household Conversions

• 1 tsp = 5 mL
• 1 tbsp = 15 mL
• 1 oz = 30 mL
• 1 cup = 240 mL

Time

• 60 seconds = 1 minute
• 60 minutes = 1 hour
• 24 hours = 1 day

Military Time Quick Guide

• 1300 = 1:00 PM
• 1400 = 2:00 PM
• 1800 = 6:00 PM
• 2300 = 11:00 PM

Dimensional Analysis (The Safest Method)

Dimensional analysis prevents most mistakes because units cancel.

Example setup:

Desired unit × (conversion factor)

Always write units. If they cancel properly, you are likely correct.

Worked Practice Problems

Problem 1 (Multiple Choice)

Convert 2.5 grams to milligrams.

A. 25 mg
B. 250 mg
C. 2500 mg
D. 25,000 mg

Step-by-Step

1 g = 1000 mg

2.5 g × 1000 mg = 2500 mg

Correct Answer: C

Problem 2 (Open Response)

Convert 0.75 L to mL.

Solution

1 L = 1000 mL

0.75 × 1000 = 750 mL

Final Answer: 750 mL

Problem 3 (Multiple Choice)

What is 30% of 250?

A. 50
B. 60
C. 75
D. 90

Solution

30% = 0.30

0.30 × 250 = 75

Correct Answer: C

Problem 4 (Ratio)

A ratio of 3:5 is equivalent to which fraction?

3 ÷ 5 = 0.6

Answer: 3/5 or 0.6

Problem 5 (Word Problem)

A student studies 45 minutes per day. How many hours is that in one week?

45 minutes × 7 days = 315 minutes

315 ÷ 60 = 5.25 hours

Final Answer: 5.25 hours

Problem 6 (Multiple Choice)

Convert 3 tablespoons to milliliters.

A. 30 mL
B. 45 mL
C. 60 mL
D. 90 mL

Solution

1 tbsp = 15 mL

3 × 15 = 45 mL

Correct Answer: B

Problem 7 (Fraction to Decimal)

Convert 3/4 to a decimal.

3 ÷ 4 = 0.75

Answer: 0.75

Problem 8 (Military Time)

What time is 1630 in standard format?

1600 = 4:00 PM
1630 = 4:30 PM

Answer: 4:30 PM

Problem 9 (Multi-Step)

A container holds 2.5 L. Convert to mL.

2.5 × 1000 = 2500 mL

Answer: 2500 mL

Problem 10 (Percent Increase)

A score increases from 70 to 84. What is the percent increase?

Increase = 14

14 ÷ 70 = 0.2

0.2 × 100 = 20%

Answer: 20%

How to Practice Efficiently

• Practice daily for 20–30 minutes
• Mix conversions with percentages
• Review mistakes immediately
• Time yourself during the final week

If you want structured math drills with adaptive feedback, explore: https://goodnurse.com/hesi-exam-prep

Final Takeaway

HESI math is not advanced calculus.

It is precision, structure, and unit awareness.

Master conversions. Use dimensional analysis. Practice consistently.

Accuracy builds confidence. Confidence improves scores.