a carpenter was putting up a shelf. the shelf needed to be 87 centimeters long but the piece of wood she had was 1 meter and 28 centimeters long. her saw was 46 cm long. how much did she have to cut off the piece of wood?
To determine how much the carpenter needs to cut off the piece of wood, we need to subtract the desired length of the shelf from the length of the piece of wood.
The carpenter had a piece of wood that is 1 meter and 28 centimeters long, which can be represented as 1 meter + 28 centimeters. Since 1 meter is equal to 100 centimeters, we can convert the length of the piece of wood to centimeters by calculating 1 meter * 100 centimeters/meter + 28 centimeters = 128 centimeters.
The desired length of the shelf is 87 centimeters.
To find out how much the carpenter needs to cut off the wood, we subtract the desired length of the shelf from the length of the piece of wood: 128 centimeters - 87 centimeters = 41 centimeters.
Therefore, the carpenter needs to cut off 41 centimeters from the piece of wood.