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Copyright(c)Ed2NetLearning. Inc 3 Previous Knowledge Find the GCF of the following: 1.24, , , , , 320
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Chapter – 6Lesson 43
Multiplying Fractions and Fractions
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Objectives
• To multiply fractions
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Previous Knowledge
• Find the GCF of the following:1. 24, 322. 15, 453. 39, 784. 108, 725. 600, 320
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Multiplying Fractions
• To multiply fractions, multiply the numerators and multiply the denominators.
• Example: Arithmetic • 2/5 x ½ = 2 x 1 = 2/10
5 x 2Algebra : a x c = a x c b d b x d
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Example - Multiply Fractions• Find 1/3 x ¼
1/3 x ¼ = 1 x 1 3 x 4 = 1 12
Multiply the numeratorsMultiply the denominators
Simplify
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Practice Problems
Multiply and write in simplest form:1. ½ x ¾ 2. 1/3 x 2/33. ¼ x ¾ 4. 1/3 x 3/85. 2/3 x 4/96. 5/6 x 5/8
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Simplify before Multiplying
• If the numerator and denominator have a common factor, we can simplify before we multiply.
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Example – Simplify before multiplying
• Find 1/3 x ¾ 1 x ¾
3 = ¼ 1
1
The numerator 3 and the denominator 3 have common factor 3Divide both the numerator and denominator by 3
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EXAMPLE – 2
• Find ¾ x 4/9 • ¾ x 4/9= 3 x 4
4 9 = 1
3
1 1
13
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Practice Problems
Multiply and write in its simplest form:1. 3 x 45 5 272. 5 x 16 8 17 3. 6 x 44
11 45 4. 7 x 1 13 56 5. 4 x 28
7 36
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Let’s Play
• http://www.thekidzpage.com/freekidsgames/games/bounce/kids-games-eggscramblers.html
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Word Problems
• 3/8 of the school campus is used for class rooms and 2/5 of the campus is used for games fields. How much space is used?
• 3/8 x 2/5= 3/20 of school space
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Now your Turn
• There was 1/5 of a tin of yellow paint and ¼ of a tin of green paint left over after painting my room. How much paint was left over?
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Review
• To multiply fractions, multiply the numerators and multiply the denominators.
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Assessment SheetMultiply.1. 3/8 x 2/32. 5/4 x 8/73. 4/5 x 5/74. 4/15 x 3/205. 4/7 x 21/286. 2/3 x ½7. ½ x ½8. 4/5 x 5/39. ¾ x 4/510. 6/15 x 3/5
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That’s all for today
• Go through the chapter and try to do the assessment sheet
