6 month-old babiesDiscriminate 8 vs. 16, but not 8 vs. 12, Ratio of 1:29 month-old babies16 vs. 24Ratio 2:3Adults: ratio of 9:10. . Babies tool kit for math . . Approximate and analogical number representationIncreasing acuity over developmentMath learning disability is due to an impairment at that level (lower acuity) ?persistent, specific disorder of numerical competences and arithmetic skills development in children of normal intelligence .
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