Answer:
40x10=400
Explanation:
40+40=80
80+40=120
120+40=160
160+40=200
That is 5 40's in total, now do 200 plus 200, which is 400
(5+5)(20+20)=400
(5+5((10+10)+(10+10))=400
easy
400
setian 400
eso es todo
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