What is twice the size as 10

Question

I need to know how many is twice 10 plzzzzz 

Answer 1

2 times 10 equals 20

2x10 =20

in long hand multiplication, multiply 2 x 0 to get 0 for the ones digit

then 2x1 to get the ten's digit

put them together to get 20

multiplying by 10 just adds a zero to the other number, it changes 2 to 20

This works in theory, abstractly, but in practical sizes, shoe size, ring size, other clothing sizes, it may not be that twice a size number is really twice as big. Or, 100 percentile score on a test doesn't really show twice as much knowledge exhibited by a student who had a 50th percentile test score.