Pearson Algebra 1 Common Core, 2011
PA
Pearson Algebra 1 Common Core, 2011 View details
7. The Distributive Property
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Exercise 45 Page 50

Write 3.9 as a difference.

23.4

Practice makes perfect
To use mental math to multiply we can rewrite 3.9 as a difference of 4-0.1 and then distribute 6 with the terms inside the parentheses.
3.9 * 6
(4-0.1)6
(4)6-(0.1)6
24-0.6
23.4
The product equals 23.4