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Make a ten or a hundred to add mentally 339+123

Make a ten or a hundred to add mentally 339+123
asked 159k views
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Make a ten or a hundred to add mentally 339+123

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User Spectric
by
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1 Answer

2 votes
9+3=12
30+20=50
300+100=400
Then add.
12+50+400=462
So 339+123=462
answered
User Samach
by
8.1k points
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