sql - Update multiple rows in a column in MySQL -

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i'm having table that:

number 1   2   3   4   5

i want change value in row 1 1 8, used

update tablea set number=8 number=1

the resulting table looks follows:

number 8 2  3  4   5

so far tried query below update multiple rows, 

   update tablea set number=8 number=1;    update tablea set number=10 number=2;    update tablea set number=11 number=4;

and works fine possible reduce simpler?

in query can this:

update tablea set number = number + 7 number in (1,4); update tablea set number=10 number=2;

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