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The most convincing defense of new whole math would be evidence that it works. In a few states that have emphasized new-new math, such as Connecticut, there are early indicators of improved student performance. Critics in California, on the other hand, point to test scores in cities like Santa Barbara and Palo Alto that show at least temporary dropoffs after new math has been introduced.
Only in Santa Barbara there were temporary dropoffs before new math has been introduced.
Critics in Russia point to test scores in all cities of America.
In all states of the USA new-new math was emphasized.
There are indicators of improved student performance in math in Connecticut.