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Master BMI Practice Problems with Quiz Challenge

Sharpen Your BMI Skills with Problem Solving Practice

Editorial: Review CompletedCreated By: Zach BlaisUpdated Aug 26, 2025
Difficulty: Moderate
Grade: Grade 8
Study OutcomesCheat Sheet
Colorful paper art promoting BMI Brain Busters high school trivia quiz

Use this quiz to work through BMI practice problems in a 20-question high school set that covers the formula, unit conversions, and word problems. Use it to spot gaps before a test. If you miss one, use the quick reading links to review and try again.

A 16-year-old weighs 60 kg and is 1.70 m tall. What is their BMI to one decimal place?
22.1
20.8
21.8
19.8
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Which is the correct unit for BMI in standard reporting?
m/kg^2
kg
N/m^2
kg/m^2
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An adult with a BMI of 31.2 falls into which category?
Underweight
Overweight but not obese
Healthy weight
Obesity
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Convert a height of 172 cm to meters for use in the BMI formula.
17.2 m
172.0 m
0.172 m
1.72 m
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For assessing weight status in teenagers, which approach is recommended?
Waist circumference only
Adult BMI cutoffs
Skinfolds only
BMI-for-age percentile charts
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Which measurements are required to calculate BMI?
Body weight and height
Body fat percentage
Resting heart rate and age
Waist and hip circumferences
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Which is the correct imperial BMI formula?
BMI = weight(lb) * height(in) / 703
BMI = 2.2 * weight(lb) / height(in)^2
BMI = weight(lb) / height(in)
BMI = 703 * weight(lb) / height(in)^2
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An adult weighs 150 lb and is 5 ft 6 in tall. What is their BMI to one decimal? (Use BMI = 703 * weight(lb) / height(in)^2)
24.2
26.1
23.0
22.5
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A person has BMI 23.26. Rounded to one decimal place, what is the BMI?
23.3
23.4
23.0
23.2
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If someone maintains the same height but reduces their body weight by 10%, how does BMI change?
BMI decreases by 5%
BMI does not change
BMI decreases by 10%
BMI increases by 10%
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Which BMI value is the highest BMI considered healthy for most adults?
18.4
29.9
25.5
24.9
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Two classmates have the same BMI, but one is 10 cm taller. Who likely weighs more?
Not enough information to tell
The taller classmate
They weigh the same
The shorter classmate
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Which statement best describes a limitation of BMI?
It does not differentiate between muscle and fat mass
It requires expensive lab equipment
It is only valid for people over 50
It directly measures body fat percentage
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A student's height was recorded with shoes on, adding 2 cm to true height. How would this likely affect the calculated BMI?
BMI would become unitless
BMI would be unchanged
BMI would be slightly overestimated
BMI would be slightly underestimated
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A student is 1.60 m tall and weighs 72 kg (BMI = 28.1). Which change would lower BMI more: losing 5 kg or growing 5 cm (to 1.65 m) with weight unchanged?
Neither change affects BMI
Growing 5 cm lowers BMI more
Losing 5 kg lowers BMI more
Both changes lower BMI equally
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An adult is 1.80 m tall with a BMI goal of 22.0. What target weight (to the nearest 0.1 kg) corresponds to that BMI?
79.2 kg
71.3 kg
66.0 kg
75.0 kg
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A person weighs 68.0 kg and is 1.64 m tall. What is their BMI to one decimal?
25.3
26.3
24.3
23.3
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After intense exercise, a runner's body mass drops from 70.0 kg to 69.0 kg due to water loss; height is 1.75 m. What is the change in BMI to one decimal?
Decrease of 0.1
Decrease of 0.3
Increase of 0.3
No change
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For a height of 1.70 m, what weight corresponds to a BMI of 25.0?
68.0 kg
75.0 kg
70.0 kg
72.3 kg
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BMI is a dimensionless value even though it is written with units of kg/m^2.
True
False
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0

Study Outcomes

  1. Define Body Mass Index and explain its significance in assessing health.
  2. Calculate BMI accurately using appropriate formulas.
  3. Analyze BMI results within standard health categories.
  4. Apply problem-solving skills to interpret BMI-based puzzles.
  5. Evaluate factors that influence BMI calculations and outcomes.

BMI Practice Problems Cheat Sheet

  1. BMI Formula Explained - The Body Mass Index (BMI) helps estimate your body fat based on your weight and height squared, making a quick health check a breeze. For instance, if you weigh 70 kg and stand 1.75 m tall, your BMI is about 22.9, squarely in the "normal" range.
  2. BMI Categories - Underweight, normal, overweight, and obese - these categories help you see where you land on the health spectrum and flag when you might need adjustments. Understanding the cutoffs (<18.5, 18.5 - 24.9, 25 - 29.9, ≥30) makes your fitness goals clearer and more achievable.
  3. BMI as a Screening Tool - Remember that BMI is a quick check, not a microscope: it flags potential issues but doesn't measure fat directly. Pair it with other assessments, like body measurements or health screenings, for a complete picture of your well-being.
  4. Know Its Limitations - BMI can overestimate body fat in muscular athletes while underestimating it in older adults or people with low muscle mass, so always think twice before jumping to conclusions. Check muscle and fat distribution with other tools to avoid misleading results.
  5. Kiddos and Teens Need Tweaks - Standard BMI charts don't fit the rapid growth of children and teens, so pediatricians use age- and sex-specific percentiles to keep things accurate. This ensures young bodies get assessed with respect to their unique growth patterns.
  6. Fat Distribution Matters - Your waistline tells more stories than your BMI alone; belly fat is linked to higher health risks compared to fat stored elsewhere. Adding waist circumference measurements gives a sharper snapshot of potential heart and metabolic troubles.
  7. Populations and Diversity - BMI cutoffs might shift depending on your ethnicity or background, reflecting how different groups store fat and face risk. Be aware that what's "normal" for one population could mean something else for another.
  8. Tools Beyond BMI - Think of BMI as one tool in your health toolkit - waist circumference, skinfold thickness, and even bioelectrical impedance can fill in the missing pieces. A multi-tool approach ensures you don't miss key aspects of your health.
  9. Not a Diagnosis - While BMI offers a snapshot, it can't diagnose conditions like diabetes or heart disease on its own - consider it a red flag to explore further, not a verdict. Use it wisely alongside medical advice for the best outcomes.
  10. Evolving Conversations - Researchers now discuss pairing BMI with waist-to-height ratios or other measures to boost accuracy, acknowledging that a single number can't capture the complex puzzle of health. Stay tuned as guidelines evolve!
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