Question

add or subtract the following measurements. be sure each answer you enter contains the correct number of significant digits.
6.8 ml + 3.67 ml = ml
17.900 ml + 5.57 ml = ml
8.900 ml - 6.6 ml = ml

Explanation:

Step1: Add 6.8 mL and 3.67 mL

When adding or subtracting, we consider the least number of decimal places. 6.8 has one - decimal place. $6.8+3.67 = 10.47$. Rounding to one - decimal place gives 10.5 mL.

Step2: Add 17.900 mL and 5.57 mL

17.900 has three decimal places and 5.57 has two decimal places. We consider two decimal places. $17.900 + 5.57=23.47$ mL.

Step3: Subtract 6.6 mL from 8.900 mL

6.6 has one decimal place. $8.900−6.6 = 2.300$. Rounding to one - decimal place gives 2.3 mL.

Answer:

10.5 mL
23.47 mL
2.3 mL