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Nookie1986 [14]
3 years ago
7

Two different ways to find the difference for 12-3

Mathematics
2 answers:
Gennadij [26K]3 years ago
8 0
For this case we have:

 way 1:
 
Common factor 3 in the expression:
 12-3 = 3 (4-1)

12-3 = 3 (3)

12-3 = 3 (9)

 Way 2:
 
Write the number 12 as the sum of 4 times 3:
 12-3 = (3 + 3 + 3 + 3) - 3

 Then, for associative property:
 12-3 = 3 + 3 + 3 + (3 - 3)

12-3 = 3 + 3 + 3 + (0)

12-3 = 3 + 3 + 3

12-3 = 9
Scrat [10]3 years ago
7 0
12-3=9
9+3=12
12-9=3

I hope this helped!
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