Preescolar a 2.ºGeometry & TopologyPlanificado
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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Requisitos previos obligatorios, hasta el fondo: 2
Aprenderás a
- 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.
Definición
- 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.
Teorema
- 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.
Errores frecuentes
- 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.
Conduce a
Descubrimientos opcionales
- Fractions and decimals Lengths that fall between whole units lead to fractions of a unit.
- Estimation and rounding Every physical measurement is an approximation, accurate only to some precision.