Digits correct per minute
Last updated
Digits correct per minute is a math fluency measure that counts each correct digit in a student's answers on a timed probe, divided by minutes.
Topic: Measurement and data collection
In plain terms
Counting digits instead of whole answers gives partial credit and shows growth sooner. On 47 + 38, the answer 85 has two correct digits; an answer of 75 earns one. Probes are usually timed for one or two minutes and mix the fact or computation types being taught.
How it shows up in an IEP
This measure fits math computation and fact fluency goals: "on a 2-minute mixed addition and subtraction probe, the student will write 40 correct digits." Use the same probe type and scoring rules every time, and note whether the scoring counts digits in the work or only in the answer.
Example
On a 2-minute probe of single-digit multiplication facts, a student writes 22 correct digits, or 11 digits correct per minute. The goal is 30 per minute.
Related terms
- Math fact fluencyMath fact fluency is the ability to recall basic addition, subtraction, multiplication and division facts quickly and accurately.
- Curriculum-based measurement (CBM)Curriculum-based measurement is a set of brief, standardized, timed probes that measure a general skill, such as reading or math, to track growth over time.
- RateRate is the count of a behavior or response divided by the observation time, such as words per minute or requests per hour.
- ProbeA probe is a brief check of a skill, given without teaching or help, to see what the student can do independently at that moment.
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