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SingaporeMathBarModel.PDF

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SingaporeMathBarModel

Singapore Math Bar Model Strategy Bill Jackson Scarsdale Public Schools bjackson@scarsdaleschools.org This presentation cannot be copied or used without the consent of the author. Part-Whole Model for Addition and Subtraction 134 girls and 119 boys took part in an art competition. How many children took part in the competition?   We know the 2 parts. To find the whole, we add 134 + 119. ? girls boys 134 119 This problem and the following problems are taken from Primary Mathematics, Marshall Cavendish, publisher 253 children took part in an art competition. There are 134 girls. How many boys are there?   We know the whole and 1 part. To find the missing part, we subtract 253 – 134. 253 girls boys 134 ? Comparison Model for Addition and Subtraction 119 boys took part in an art competition. 15 more girls than boys took part. How many girls took part in the competition?   We are comparing the boys to the girls. We know the smaller quantity. To find the bigger quantity we add 119 + 15. 119 15 boys girls ? 134 girls took part in an art competition. 15 fewer boys than girls took part. How many boys took part in the competition?   We are comparing the girls to the boys. We know the bigger quantity. To find the smaller quantity we subtract 134 – 15. 134 girls boys