5 exercises on reading fractions, ratios and performance metrics aloud.
0 / 5 completed
1 / 5
How do you read the fraction "1/2" aloud in normal speech?
"1/2" is normally "one half" or "a half". For simple fractions, English uses ordinal-style names: 1/2 = "a half", 1/3 = "a third", 1/4 = "a quarter", 3/4 = "three quarters". In code or formulas you might say "one over two" to be explicit about division, but in plain speech "one half" is natural. Note "1/2 of the requests" = "half the requests". The slash is read "over" only when emphasising the division operation, e.g. reading "x/y" as "x over y".
2 / 5
How do you read a "3:1 ratio" aloud?
"3:1" is read "three to one". The colon in a ratio is spoken as "to". So a "3:1 compression ratio" is "three-to-one compression ratio". Other examples: "16:9 aspect ratio" = "sixteen to nine", "2:1" = "two to one". Do NOT say "colon" or "over" for ratios - "to" is the standard. This appears in aspect ratios, compression ratios, contrast ratios (WCAG requires "four-and-a-half to one" for text), and load-balancing weights.
3 / 5
How is "99.99%" ("four nines") read aloud?
"99.99%" is "ninety-nine point nine nine percent", and in reliability slang it's called "four nines". After the decimal point, read digits individually: "point nine nine", not "point ninety-nine". SRE teams say "we target four nines of uptime" (99.99%), "five nines" = 99.999%. The phrase counts the total number of 9 digits. So "three nines" = 99.9%. Knowing both the spoken number and the "N nines" shorthand is essential in availability and SLA discussions.
4 / 5
How do you read "10x" (as in "10x performance")?
"10x" is "ten times", or casually "ten-ex". The "x" means "times" (multiplication factor). So "10x faster" = "ten times faster", "a 2x speedup" = "a two-times speedup" or "two-ex speedup". The informal "ten-ex" (saying the letter X) is very common in tech and startup culture, as in "a 10x engineer" = "a ten-ex engineer". Both readings are understood. The "x" here is a multiplier suffix, distinct from the "0x" hex prefix or "x" as a variable.
5 / 5
How do you read the latency metric "p95" aloud?
"p95" is read "p ninety-five", meaning the 95th percentile. The "p" stands for percentile, and the number is read normally: "p ninety-five latency is 200 milliseconds." Similarly "p99" = "p ninety-nine", "p50" = "p fifty" (the median), "p99.9" = "p ninety-nine point nine". These percentile metrics dominate performance and SLO discussions: "our p99 spiked". Don't read the digits separately ("p nine five") - read 95 as a normal number, "ninety-five".