Singapore Math was originally developed in the country of Singapore. Students in Singapore are distinguished among their international counterparts for receiving high marks in math. Singapore's Primary Mathematics U.S. Edition includes additional information to teach math relative to American culture (U.S. currency, pounds, ounces, etc.). More on Singapore Math HERE
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We currently use Singapore Math for our primary age children. I love the consumable workbooks over the typical text book. Younger children seem (to me anyway) handle the workbooks better. After primary math they move on to Saxon. For younger children I prefer Rays or Singapore. I basically use which ever I happen to have on hand.
