Concrete-Representational-Abstract: CRA is a research-based strategy, proven effective for teaching abstract mathematical concepts to students with learning disabilities. This is especially useful for students at the secondary level.
Research:
Witzel, B.,Mercer, C., & Miller, D. (2003). Teaching
algebra to students with learning difficulties: an investigation of an explicit
instruction model. Learning Disabilites
Research & Practice, 18(2), 121-131.
Allsopp (1999); Baroody (1987); Butler, Miller, Crehan, Babbit, & Pierce (2003); Harris, Miller, & Mercer (1993); Kennedy and Tips (1998); Mercer, Jordan, & Miller (1996); Mercer and Mercer (2005); Miller, Butler, & Lee (1998); Miller and Mercer, 1995; Miller, Mercer, & Dillon (1992); Peterson, Mercer, & O'Shea. (1988); Van De Walle (2005); Witzel, Mercer, & Miller (2003).
Source: http://www.coedu.usf.edu/main/departments/sped/mathvids/strategies/cra.html#
Allsopp (1999); Baroody (1987); Butler, Miller, Crehan, Babbit, & Pierce (2003); Harris, Miller, & Mercer (1993); Kennedy and Tips (1998); Mercer, Jordan, & Miller (1996); Mercer and Mercer (2005); Miller, Butler, & Lee (1998); Miller and Mercer, 1995; Miller, Mercer, & Dillon (1992); Peterson, Mercer, & O'Shea. (1988); Van De Walle (2005); Witzel, Mercer, & Miller (2003).
Source: http://www.coedu.usf.edu/main/departments/sped/mathvids/strategies/cra.html#
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