Students compare and order lengths, heights, capacities, and masses using direct comparison and equal-sized informal units, measure lengths by iterating units without gaps or overlaps, estimate lengths, and measure capacity with equal scoops while recognizing that appearance alone can mislead. Students describe temperatures with hot, warm, cool, and cold; identify morning, afternoon, evening, and night; sequence daily events, compare durations informally, read clocks to the hour and half hour, and use calendars to identify days and dates. Students solve simple measurement stories involving lengths and other measurable quantities by representing totals, differences, and missing parts with addition or subtraction within 20 using the same whole-number unit.