Measurement & Time
18 problem types · Pick a group to see its problem types.
7 Grades 2–4
Length as Sum of Parts with Unit Matching
A total length or distance is the sum of its segments, but only after every measurement is expressed in the same unit. Learners unify handspans and rulers, convert km/m/cm, and accumulate multi-leg distances. Matching units before combining is the habit that prevents the most common measurement errors.
7 types → 11 Grades 2–3
Elapsed Time and Base-Sixty Regrouping
Time arithmetic regroups at sixty (seconds, minutes) and at twelve/twenty-four (hours, AM/PM), with days and weekdays cycling on top. Problems find elapsed time between clock readings, future dates, and the error of a fast or slow clock. It is place-value regrouping in a mixed-base system.
11 types →Length as Sum of Parts with Unit Matching ↑ All groups
Find one handspan from measured counts Measurement & data
Smaller unit, more measured counts Measurement & data
Bigger units express numbers more simply Measurement & data
Convert to one unit, then compare lengths Measurement & data
Match units before comparing path lengths Measurement & data
Sum distances and times across legs Measurement & data
Total length is the sum of its parts Measurement & data
Elapsed Time and Base-Sixty Regrouping ↑ All groups
Find a future date using days per month Measurement & data
Compare hours first, then minutes Measurement & data
Read the hour when the hand is between Measurement & data
A drifting clock accumulates daily error Measurement & dataOperations
AM and PM make a 24-hour day Measurement & data
Elapsed time between two clock times Measurement & data
Reach the next hour, then add the rest Measurement & data
Read a mirrored clock, then find elapsed time Measurement & data
Reason about a fast or slow clock Measurement & data
Time regroups in base sixty Measurement & data
Express minutes as fractions of an hour FractionsMeasurement & data