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Molodets [167]
3 years ago
5

Plz help plz thanks so much this is for my sister plz help

Mathematics
2 answers:
Musya8 [376]3 years ago
8 0
6 + 21 = 27 (Add six ones)
60 + 21 = 81 (Add six tens)

I hope this helps:) 
I'm sorry if it doesn't:(
rusak2 [61]3 years ago
5 0
1. 1+1+1+1+1+1+21
2.10+10+10+10+10+10+21
good luck
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