of means Multiply
1/5 of 53
= 1/5 ร 53
= 53/5
ย
1 / 3 of 2 1/4
= 1/3 ร 2 1/4
=1/3 ร (2+1/4)
= 1/3 ร ((2 ร 4 + 1)/4)
= 1/3 ร ((8 + 1)/4)
= 1/3 ร 9/4
= 9/(3 ร 4)
= 3/4
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