Tuesday, 7 November 2017

Working it out (maths)

67+38= 105  (60+30=90 8+7=15 90+10=100 100+5=105)
74+46= 120 (70+40=110 6+4=10 110+10=120)
92+67= 159 (90+60=150 7+2=9 150+9=159)
197+63= 160 (90+60=150 7=3=10 150+10=160)
328+672= 1000(300+600=900 70+20=90 8+2=10 900+90=990+10=1000)
475+5695= 6170 (600+400=1000 90+70=160 5+5=10 1000+5000=6000 6000+100=6100 6100+60=6160 6160+10=6170)
6726+699= 7421 (700+600=1300 20+90=110 9+2=11 1000+6000=7000 7000+300=7300 7300+110=7410 7410+10=7420 7420+1=7421)
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