A simple calculation method of 630 △ 42

630÷42 ＝630÷（7×6）＝630÷7÷6 ＝90÷6 =15

Divide 4.2 by 0.5 and calculate with a simple method

At the same time, it's expanded tenfold. 42 divided by 5 equals 8.4

3.25 divided by 2.5 divided by four, with a simple method

3.25÷2.5÷4
=3.25÷(2.5*4)
=3.25÷10
=0.325

What is the quotient of 310.2 minus 2.5 divided by the product of 0.3 and 2?

(310.2-2.5)÷(0.3x2)=512.83

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