4 * 1 / 11 + 4 * 2 / 5 + 2 * 1 / 5 + 7 * 1 / 11 What's the simple way to calculate

4 * 1 / 11 + 4 * 2 / 5 + 2 * 1 / 5 + 7 * 1 / 11 What's the simple way to calculate

Transpose first
=(4 * 1 / 11 + 7 * 1 / 11) + 4 * 2 / 5 + 2 * 1 / 5 with or without brackets can be added, not easy to confuse
Then work out the last item first
=(4 * 1 / 11 + 7 * 1 / 11) + (4 * 2 / 5 + 2 / 5)
Merge similar items again
=(4 + 7) * one eleventh + (4 + 1) * two fifths
calculation
=11 * 1 / 11 + 5 * 2 / 5
=1+2
=When you can skillfully calculate, you can save the intermediate steps. I hope it can help you

12 and two fifths - (1 and two fifths + 2 and two fifths) = () simple method

12 and two fifths - (1 and two fifths + 2 and two fifths)
=12 and two fifths - 2 and two fifths - 1 and two sevens
=10-1 and two out of seven
=Eight and five seventh

Is 6 times 12 divided by 3 = 6 times 4 = 24 the right algorithm?

From the results, all right. Playing cards in the 24 is this way

A simple algorithm for 68 times 35 + 408 divided by 24

68 times (30 + 5) + 408
=68 times 30 + 68 times 5 + 400 + 8
=2040+340+400+8
=2780+8
=2788