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The Lumenary
K–2Geometry & TopologyPlanned

Measuring length and time

Comparing and ordering objects by length, measuring with non-standard and standard units, and telling time to the hour and half hour.

math.geom.measurement

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The lesson for this topic has not been written yet. The outline below is part of the curriculum map and has not been reviewed.

Builds on

Counting

Required prerequisites, all the way down: 2

You will learn to

  • Compare and order objects by length, directly and by using a third object.
  • Measure lengths by laying copies of a unit end to end without gaps or overlaps, and then with a ruler.
  • Tell and write time to the hour and half hour on analogue and digital clocks.

Definition

  • A unit is a fixed amount used for measuring, such as a centimetre or the length of a paper clip.
  • The length of an object is the number of units that fit along it end to end.

Theorem

  • Measuring the same length with a smaller unit gives a larger number.
  • If A is longer than B and B is longer than C, then A is longer than C.

Common misconceptions

  • Starting to measure from 1 on a ruler instead of from 0.
  • Leaving gaps or overlaps between units.
  • Thinking a string becomes shorter when it is bent.

Leads to

Area, perimeter and angles

Optional discoveries