To the outsiders of the USA, we can understand the “Common Core Math Program” is good for American children education, which is supported by Bill Gates with generous $6-billion donation.
The American parents who resist and oppose the ‘Common Core’ Math were like the Singaporean parents who opposed the “Singapore Math Program” in the 1980s. The Singapore parents had to go through remedial classes before they could coach their kids in the ‘new way’. Result proved that after 20 years, Singapore is ranked 2nd in the PISA Test World Ranking in Math (after Shanghai of China).
All good medicines are bitter to swallow. 良药苦口 !
Here are 4 methods of subtraction:
1st : Traditional (aka Abacus) “Carry” Method
2nd: Mental Calculation
3rd : “Singapore Math” (no Carry)
4th: Common Core: “Count Up” (French Method), with which French supermart cashiers usually perform changes at counter — much…
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