Vertical rods on Abacus are used to represent the place value of number. If the centre rod of Abacus is place of One's or Unit, the immediate next rod to the left is theplace of Ten's and the immediate nest rod to the left of Ten's is Hundred's and so on and so forth for thousand, 100 Thousand, Million's etc.
A: For standard box springs, twin sizes are usually 38 or 39 inches wide by 75 inches long, and full sizes are 53 or 54 inches wide by 75 inches long. Queen- and king-size box springs are both 80 inches long, but measure 60 inches and 76 inches wide, respectively.
A Twin by Any Other Name. A standard twin mattress is 39 inches wide and 75 inches long. Daybed, bunk bed or trundle bed mattresses in most cases are standard twin bed sizes. Some trundle bed frames come in full size as well; the mattress may be full or twin. If unsure, measure the mattress or frame. A twin or trundle mattress is not the same as a twin XL mattress, which is five inches longer and won't fit on a standard trundle or twin frame.