A simple method of 5.4 times 0.72 divided by 0.72 divided by 5.4

A simple method of 5.4 times 0.72 divided by 0.72 divided by 5.4

5.4×0.72÷0.72÷5.4
＝5.4×﹙0.72÷0.72﹚÷5.4
＝5.4×1÷5.4
＝5.4÷5.4
＝1

Simple algorithm of 840 times 39 divided by 84

=840 divided by 84 and multiplied by 39
=10*39
=390

The simple algorithm of 104 × 25 is

104*25=100*25+4*25=2500+100=2600

A simple algorithm of dividing 4800 by 45

4800/45
=4800*2/45*2
=9600/90
=960/9
=320/3

15 times 7 / 8 divided by 7 / 8 divided by 45 can be used with a simple algorithm

The original formula is 15 ／ 45 × (7 / 8 ／ 7 / 8) = 1 / 3

A simple algorithm of dividing 4.3 by 2.5

4.3÷2.5
=4.3×4÷10
=17.2÷10
=1.72

() 8 / 3 = 8 / 9 divided by () = 3 / 2 - () = 4 / 5 + ()
RT

(3 / 8) X3 / 8 = 8 / 9 divided by (8 / 9) = 3 / 2 - (1 / 2) = 4 / 5 + (1 / 5)

Eleven out of eighteen plus eight out of nine multiplied by two-thirds and divided by two

A simple operation of nine eighths multiplied by eleven eighths and two thirds divided by two

((9/8*11/18)*2/3)/2=9/8*11/18*2/3*1/2=(9*11*2)/(8*18*3*2)=11/(8*2*3)=11/48

Simple calculation of 3 / 8 × 5 / 11 + 0.375 × 2 and 6 / 11-3 divided by 3 / 8

=3 / 8 × 5 / 11 + 3 / 8 × 2 and 6 / 11-3 △ 3 / 8
=3 / 8 (5 / 11 + 2 and 6 / 11) - 3 × 8 / 3
=3/8×3-8
=Negative 6 and 7 / 8