Khoury and Zazkis (1994; Zazkis & Khoury, 1993) proposed that explorations of
PTs’ concepts rather than their ability to apply rules could be conducted using quantities in
bases other than ten, for example, converting 12.34five to base ten. They reasoned that such
tasks would encourage the participants to use a general place-value structure rather than
rules or procedures. Zazkis and Khoury found that PTs related the fractional part of a
number to the base in the number in non-standard ways. For example, in 12.34 five, some
PTs suggested that the 3 was in the 0.5 position and the 4 was in the 0.05 position,
reasoning that is aligned with the consistent use of 1 in decimal notation for tenths (0.1)
and hundredths (0.01). Other PTs ignored the fractional part of the number, noting that
decimals exist only in base ten (Zazkis & Khoury, 1993). The digits after the decimal were
unchanged, while the integer part of the number was converted using a conventional
strategy.
Khoury and Zazkis (1994; Zazkis & Khoury, 1993) proposed that explorations of PTs’ concepts rather than their ability to apply rules could be conducted using quantities in bases other than ten, for example, converting 12.34five to base ten. They reasoned that such tasks would encourage the participants to use a general place-value structure rather than rules or procedures. Zazkis and Khoury found that PTs related the fractional part of a number to the base in the number in non-standard ways. For example, in 12.34 five, some PTs suggested that the 3 was in the 0.5 position and the 4 was in the 0.05 position, reasoning that is aligned with the consistent use of 1 in decimal notation for tenths (0.1) and hundredths (0.01). Other PTs ignored the fractional part of the number, noting that decimals exist only in base ten (Zazkis & Khoury, 1993). The digits after the decimal were unchanged, while the integer part of the number was converted using a conventional strategy.
การแปล กรุณารอสักครู่..
