A. TRUE
It's Associative Property.
The "Associative Property (Laws)" say that it doesn't matter how we group the numbers (i.e. which we calculate first)
(a × b) × c = a × (b × c)
(6 × 10) × 7 = 6 × (10 × 7)
L = 60 × 7 = 420
R = 6 × 70 = 420
L = R
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