Add by 10 each time.
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50 + 40 + 40 + 40 + 30 + 30 + 20 + 10 = 260
20+30+40+50+60+70+80 = 350Or (2+3+4+5+6+7+8)×10 = 350I'm not quite sure what 'pattern' means?
10 20 30 40 50
10 20 30 40 50 60 70 80 90 100. That’s how we do it
10 ,20 ,30 ,40 ,50