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8th 5-6 Percent and Estimation
Hauen laguntzarekin: Math
Compatible means: "able to exist or occur together without conflict"
Who is someone you are compatible with?
You can use compatible 
numbers to estimate a percent of a number.
someone you dislike 
your worst enemy
your BFF
Compatible numbers are two numbers that are easy to divide mentally.
11
Match each number with a compatible number
8
3
64
?
22
?
9
?
17
7
5
49
?
20
?
34
?
21% is about 20% or 1/5.  
Estimate 21% of 54.
Estimate 21% of 54 is about or ≈
5
1
of
55
1
54 is about 55.
Match the compatible numbers then solve:
24% of 36
67% of 44
19% of 42
73% of 98
21% of 101
¼ of 36 = 
?
1/5 of 40 = 
?
¾ of 100 = 
?
⅔ of 45 = 
?
1/5 of 100 = 
?
Estimate each percent
7 out of 15
5 out of 51
13 out of 17
8 out of 35
6 out of 23
7/14 or 1/2 = 
?
5/50 or 1/10 =
?
12/16 or 3/4 = 
?
6/24 or 1/4 =
?
7/35 or 1/5 =
?
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