70 - 50+20=, 60 - 30+30=, 6 - 3+3=, 100 - 90+10=, 8 - 6+2=, 80 - 60+20=, 9 - 7+2=, 90 - 70+20=, 20 - 10+10=, 10 - 5+5=,

Adding decade numbers

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