Find the sum of 301 + 173 + 427 using mental math and the associative property of addition. Show how you can use the property to group the two of the address. Explain how you found the sum.
2 answers:
Sum Using Associative property of addition
A+(B+C)=(A+B)+C=(A+C)+B
→301 + 173 + 427
=301 +(173+427)------Combining 173 and 427 first ,as adding unit digit of both three digit number gives 0.
=301 + 600
=901
⇒Using mental math
Add Hundreds=300+100+400
=800
Add tens=73+27
=100
Ones=1
Combine these three numbers
=800+100+1
=901
Mental math and associative property of addition
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