Can someone answer these math questions?! Test of Genius worksheet.?

(1) Make this equation correct by changing the position of only one digit.

101-102=1

(2) Steven has 9 gold coins that are identical in appearance. However, one coin is counterfeit and weighs slightly less than the others. Using a balance scale, how can he find the counterfeit coin inn just two weighings?

(3) In the following addition problem, the letters A,B,and C stand for three different digits. What digit should replace each letter?

ABC
+ ACB
————-
CBA

(4) The teacher noticed there were fewer than 100 students on the playground. When she counted them by 2s, there was 1 student left over. In fact, when she counted them by 3s, 4s, 5s, or 6s, there was always 1 student left over. How many students were on the playground?

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