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14 March, 07:57

How do you do this properties and mental math to solve 275+180+120 =

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  1. 14 March, 08:05
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    Make 275 t0 200 and 180 to 100 and 120 to 100

    200+100+100=300

    now turn 75 to 70 and 80 will stay 80 and 20 will stay 20

    70+80+20=170

    now add the 5 to 170 = 175

    now add 300 to 175 to get 475 which is ya answer
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