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## 5th grade foundations (Eureka Math/EngageNY)

### Course: 5th grade foundations (Eureka Math/EngageNY) >Unit 3

Lesson 4: Topic D: Foundations

# Fraction word problem: lizard

Sal solves a fraction word problem about the length of a lizard.  The fractions have common denominators.  Created by Sal Khan.

## Want to join the conversation?

• is multiplication of fractions same as adding fractions
• Also, when you multiply two fractions less than one, your answer actually gets smaller. Think about the multiplication sign as saying "groups of." 3 x 8 = 24 means 3 groups of 8 are 24.

With fractions, you're still saying that. 1/2 of a group of 12 is 6. 1/3 of a group of 9 is 3.

The procedure for two fractions is to multiply across -- numerator times numerator and denominator times denominator.

1/2 x 2/3 is saying that you have half of a group that was 2/3 of a full group to begin with. So, you had 2 thirds, but not you only have half of that, or 1/3

numerators : 1 x 2 = 2
denominators: 2 x 3 = 6

So the answer is 2/6, which can be reduced to the equivalent fraction 1/3.
• so 3/4 of an hour is 45 min right?
• yes an hour has 60 min so 1/4 of an hour is 15 min so multiply that by 3 and you get 45
• Does the end result have to be a mixed fraction?
• Not always. It could be a decimal for example.
• The lizard is very nice.
• yes it is
(1 vote)
• um did sal draw the lizard (sorry if this was against the rules im just curious!) ?
• I kind of get confused with the ruler thingy but it is very helpful, in fact I get it now just by looking at the problem so... nah.
• ok its good that u understand it now so....yeah!
(1 vote)
• how can you ad the tail and body together shouldent it be head body and tail?