🔍 Key Concepts

• Place value of decimals in the inch system (tenths, hundredths, thousandths, ten-thousandths, etc.) • How to say 0.0001 as a fraction of an inch • Difference between thousandths (0.001) and ten-thousandths (0.0001) of an inch

💭 Think About

• Write 0.0001 as a fraction with 1 in the numerator and a power of 10 in the denominator. What power of 10 do you get? • Compare 0.0001 with 0.001. Which one is smaller, and by what factor? How does that change the name of the unit? • Count how many decimal places are to the right of the decimal point in 0.0001. What place value does that correspond to?

✅ Before You Answer

• Be sure you know that 0.001 inch = one thousandth of an inch and use that as a reference point. • Verify how many zeros after the decimal before the 1 are in 0.0001 and match that to the correct place value name. • Eliminate any choices that imply too big or too small a fraction compared to 0.001 inch.