Playing with Numbers

• Any two-digit number ab, made of digits a and b, can be written in general form as ab = 10a + b whereas the number ba can be written as ba = 10b + a.

For example, 45 = 4 × 10 + 5 and 54 = 5 × 10 + 4

• A three-digit number abc, made of digits, a, b, and c, can be written in general form as abc = 100a + 10b + c.

For example, 456 = 4 × 100 + 5 × 10 + 6

• The sum of a two-digit number and the number …