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Which choice shows 40+30+10 rewritten correctly using the commutative property and then simplified correctly?

A. 40+10+10+10+10=50+10+10+10=60+10+10=70+10=80
B. 40+10+10+10+10=50+10+10=60+10=70
C. 40+10+30=50+40=90
D. 40+10+30=50+30=80

1 answer

D. 40+10+30=50+30=80
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