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One square inch is a square that is 1 inch wide and 1 inch tall.
The formula is: 1 inch length times 1 inch width times 1 inch height makes 1 cubic inch.
Volume of 1 inch block is 1 cubic inch Volume of 1/2 inch block is (1/2) x (1/2) x (1/2) = 1/8 cubic inch Therefore number of 1/2 inch blocks in 1 cubic inch block = 1/(1/8) = 8
1/10 inch = 1/10 inch
a 1 inch eraser