Lacevedo525 Lacevedo525
  • 22-09-2015
  • Mathematics
contestada

Break apart addends make a ten or a hundred to add mentally 339+123

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ZigZag27 ZigZag27
  • 22-09-2015
9+3=12
30+20=50
300+100=400
Then add.
12+50+400=462
So 339+123=462
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