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# Unit Transfer Method In action

## on Jun 02, 2010

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Singapore Maths

Singapore Maths
Before & After Concept

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## Unit Transfer Method In actionPresentation Transcript

• A restaurant has the same number of apples, oranges and pears at first. After 38 pears, some apples and oranges were used, there were 90 fruits left. There were twice as many apples as oranges left. The number of pears left was 15 fewer than the number of apples left. How many oranges were used?
1 Pears Apples After Change Before Total Oranges 1u 1u 1u
• A restaurant has the same number of apples, oranges and pears at first. After 38 pears, some apples and oranges were used, there were 90 fruits left. There were twice as many apples as oranges left. The number of pears left was 15 fewer than the number of apples left. How many oranges were used?
1 1u Pears 1u Apples After Change 1u Before Total Oranges 2 -38 – ? – ? 90
• A restaurant has the same number of apples, oranges and pears at first. After 38 pears, some apples and oranges were used, there were 90 fruits left. There were twice as many apples as oranges left. The number of pears left was 15 fewer than the number of apples left. How many oranges were used?
1 -38 1u Pears – ? 1u Apples 90 After – ? Change 1u Before Total Oranges 2 3 1p 2p 2p – 15
• A restaurant has the same number of apples, oranges and pears at first. After 38 pears, some apples and oranges were used, there were 90 fruits left. There were twice as many apples as oranges left. The number of pears left was 15 fewer than the number of apples left. How many oranges were used?
2p + 1p + 2p – 15  90 5p – 15  90 5p  90 + 15 = 105 1p  105 ÷ 5 = 21 1u  2p – 15 + 38 = 2x21 – 15 + 38 = 65 65 – 21= 44 Ans: 44 oranges 1 2p – 15 -38 1u Pears 2p – ? 1u Apples 90 1p After – ? Change 1u Before Total Oranges 2 3 4