Multiply Whole Number x Fraction - Computation 4-107

Transition from adding to multiplying fractions. What's 2 x 1/4? Draw a bar model to see 2 groups of 1 fourth is 1 fourth+1 fourth = 2 fourths. Using fraction notation, 2 x 1/4 = 1/4+1/4 = 2/4 = 1/2. Shortcut? 2 x 1/4 = (2x1)/4 = 2/4. What's 3 x 1/3? 3 x 1 third = (3x1) thirds = 3 thirds. Using fraction notation, 3 x 1/3 = (3x1)/3 = 3/3 = 1.

 
 

1. Learn

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Transition from adding to multiplying fractions. What's 2 x 1/4? Draw a bar model to see 2 groups of 1 fourth is 1 fourth+1 fourth = 2 fourths. Using fraction notation, 2 x 1/4 = 1/4+1/4 = 2/4 = 1/2. Shortcut? 2 x 1/4 = (2x1)/4 = 2/4. What's 3 x 1/3? 3 x 1 third = (3x1) thirds = 3 thirds. Using fraction notation, 3 x 1/3 = (3x1)/3 = 3/3 = 1.

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2. Practice

Lesson
4-107
Lesson
4-107
Lesson
4-107
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3. Apply

POD
4-107
POD
4-107
POD
4-107
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