Measuring length with equal units

Problem types

• Unit size and the number of units
• Measure with equal units
• Measure without gaps or overlaps
• Longest and shortest

Builds on

• Comparing length, weight, and capacity
• Adding within 10 · Useful idea

  Joining two pieces measured in the same unit gives a total length that is the sum of their unit counts.

• Ordering numbers through 10 · Useful idea

  Lengths measured in the same unit are numbers, so the greater numeral is the longer object.

Leads to

• Measuring length with a ruler
• Perimeter of a polygon · See it applied

  Perimeter measures every side with the same unit and adds the lengths.

• Area of a rectangle · See it applied

  Area covers a rectangle with equal unit squares, so counting rows of equal squares gives the area.

• Converting to a smaller unit · Extend the idea

  Measuring with a smaller unit takes more of them. Converting units uses this fact with standard units.

• Volume in unit cubes · Extend the idea

  Measuring with equal units extends from length to area to volume, where the unit is a cube.

Related skills

None listed.