conerly927
conerly927
20-09-2017
Mathematics
contestada
What is 81-16 using mental math
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apologiabiology
apologiabiology
20-09-2017
I know in my head that 16=20-4
so -16=-20+4
so 81-16 really means 81-20+4
I can first subtract 20 from 81 to get 61
then add 4 to get 65
that's my mental process to get 81-16 without writing anything down
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AnimeBrainly
AnimeBrainly
20-09-2017
81 - 16 = 65 because
80 - 15 = 65
(you just subtract 1 from both 81 and 16 to get easier numbers to minus)
hope this helps
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