Numbers are everywhere in tech meetings — load times, error rates, user counts, cost reductions. Vietnamese developers often feel confident with the concepts but stumble on HOW to say the numbers. Today: pronunciation mastery for the numbers you use every day in English technical presentations.

🗣️ Key Phrases to Say Out Loud

Practice each phrase out loud before reading on:

  1. “We reduced latency by ninety-seven percent.” /wiː rɪˈdjuːst ˈleɪtənsi baɪ ˈnaɪnti ˈsɛvən pəˈsɛnt/
  2. “Response time is fifty milliseconds P99.” /rɪˈspɒns taɪm ɪz ˈfɪfti ˌmɪlɪˈsɛkəndz piː naɪnti naɪn/
  3. “We’re handling ten thousand requests per second.” /wiːr ˈhændlɪŋ tɛn ˈθaʊzənd rɪˈkwɛsts pər ˈsɛkənd/
  4. “Error rate dropped from three point five to zero point two percent.” /ˈɛrər reɪt drɒpt frɒm θriː pɔɪnt faɪv/
  5. “The system processed one point two million records.” /ðə ˈsɪstəm ˈprɒsɛst wʌn pɔɪnt tuː ˈmɪljən ˈrɛkədz/
  6. “We’re at ninety-nine point nine percent uptime.” /wiːr æt ˈnaɪnti naɪn pɔɪnt naɪn pəˈsɛnt ˈʌptaɪm/
  7. “This saves us roughly forty hours per sprint.” /ðɪs seɪvz ʌs ˈrʌfli ˈfɔːti ˈaʊərz pər sprɪnt/

📚 Vocabulary: The Words Around the Numbers

Getting the numbers right is only half the battle — the surrounding vocabulary matters too:

  • percent /pəˈsɛnt/ — NOT “per-cent” with equal stress. Stress second syllable: “per-CENT”
  • millisecond /ˈmɪlɪˌsɛkənd/ — “MIL-i-sec-ond” (4 syllables). Common mistake: “milli-second” with wrong stress
  • throughput /ˈθruːpʊt/ — “THROO-poot” NOT “through-put”. The ‘th’ is voiced /θ/ not /t/
  • latency /ˈleɪtənsi/ — “LAY-ten-see” (3 syllables). Vietnamese speakers often say “la-TEN-cy”
  • decimal /ˈdɛsɪməl/ — “DES-i-mal”. For 3.5: “three POINT five” NOT “three comma five”
  • uptime /ˈʌptaɪm/ — “UP-time”. Two equal stresses: “UP-TIME”. 99.9%: “ninety-nine point nine percent”

Pronunciation Rules for Numbers in English

Large Numbers

Vietnamese uses a different grouping system. In English, commas mark every three digits — and the words match that structure:

  • 1,000 = “one thousand” (NOT “ten hundreds”)
  • 10,000 = “ten thousand”
  • 100,000 = “one hundred thousand”
  • 1,000,000 = “one million”
  • 10,000,000 = “ten million”

Percentages

Always say “percent” — not “percentage” — when reading out a metric:

  • “dropped by 40 percent” ✅
  • “dropped by 40 percentage” ❌

Decimals

Use “point” — not “comma” — for decimal numbers:

  • 3.5 = “three point five” ✅
  • 0.2 = “zero point two” ✅ (American English — “naught point two” is British)
  • 3.5 = “three comma five” ❌

Tech-Specific Patterns

Some numbers have special spoken forms in engineering:

  • P99 = “P ninety-nine” (percentile, not “P-nine-nine”)
  • 99.9% = “ninety-nine point nine percent” OR “three nines” (informal)
  • 50ms = “fifty milliseconds”
  • 10K = “ten thousand” (say the full word, not “ten K” in formal presentations)

🎯 Practice Now

Shadowing Script: Presenting Sprint Metrics

Read this aloud 3 times. First slowly, then at natural pace, then from memory:

“Good morning everyone. Here are our performance highlights from this sprint.

Load time improved from eight hundred milliseconds to two hundred milliseconds — that’s a seventy-five percent reduction. Our error rate is now zero point one percent, down from three point two percent last sprint. The system is currently handling twelve thousand requests per second at peak load, and our uptime this week was ninety-nine point eight percent.

On the business side: we processed one point four million user sessions, and our cloud costs decreased by thirty-two percent due to the optimization work. The team is proud of these results — any questions?”

Number Pronunciation Drills

Say each one 5 times fast, then slowly:

  1. 99.9% → “ninety-nine point nine percent”
  2. 10,000 rps → “ten thousand requests per second”
  3. 0.2% error rate → “zero point two percent error rate”
  4. 1.2M users → “one point two million users”
  5. P99 = 250ms → “P ninety-nine is two hundred fifty milliseconds”

⏱️ 5-Minute Drill

Record yourself reading this script (time it — should be ~60 seconds when spoken naturally):

“This quarter, our platform scaled to handle five million daily active users — up from one point two million. Response time at P99 is now one hundred twenty milliseconds. Our error rate is zero point zero three percent. Infrastructure costs decreased by forty-one percent while throughput increased by three hundred percent. We achieved ninety-nine point nine nine percent uptime — that’s less than one hour of downtime for the entire quarter.”

Then listen back. Check:

  • Do your numbers sound clear?
  • Is your stress on the RIGHT syllable?
  • Did you say “point” (not “comma”) for decimals?
  • Did you say “percent” (not “percentage”) for rates?

If you stumbled anywhere, that’s your weak spot — repeat just that number 10 more times until it flows.

Today’s word: throughput — the amount of data or work processed in a given time. Use it in your next technical discussion instead of “how much we handle.”

Today’s idiom: “by the numbers” — doing something precisely and methodically, following data rather than instinct. “We made the decision by the numbers” = we let the metrics decide.

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