Lacevedo525 Lacevedo525

22-09-2015
Mathematics

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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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