Maths5-Lesson1-Letters and numbers

Find ABC (here ABC and BCA are 3-digit numbers with digits A, B, C and different letters stand for different digit).

Find the value of IMC if:

The figure at the right is an addition puzzle problem containing numbers 1, 2 and 3. Fill in each □ with any digit from 0 to 9 only once. What is the sum (1 □□3)?

Complete the subtraction problem at the right. What is the smallest possible difference?

In the following deduction, M and N are single digits. What is the sum of M and N?

In the addition shown, P, Q and R each represent a single digit, and the sum is 2009. The value of P + Q + R is ?

If BOOK + BOOK + BOOK + BOOK + BOOK + BOOK + BOOK = TEST then what is the value of TEST? (BOOK and TEST are 4-digit numbers, and different letters stand for different digits).