Add or subtract the following measurement be sure each answer you enter contains the correct number of significant digits
13.677mL+7.70mL=?mL
11.70mL-10.9mL=?mL
17.50mL+5.827mL=?mL
13.677mL + 7.70mL = 21.377mL (rounded to 3 significant digits)
11.70mL - 10.9mL = 0.8mL (rounded to 2 significant digits)
17.50mL + 5.827mL = 23.327mL (rounded to 3 significant digits)
To add or subtract measurements while considering significant digits, follow these steps:
1. For addition, align the decimal points of the measurements.
For subtraction, write the larger measurement on top and the smaller one below it.
For 13.677mL + 7.70mL:
```
13.677mL
+ 7.70mL
----------
```
For 11.70mL - 10.9mL:
```
11.70mL
- 10.9mL
----------
```
For 17.50mL + 5.827mL:
```
17.50mL
+ 5.827mL
----------
```
2. Perform the addition or subtraction as usual, ignoring significant digits.
For 13.677mL + 7.70mL:
```
13.677mL
+ 7.70mL
----------
21.377mL
```
For 11.70mL - 10.9mL:
```
11.70mL
- 10.9mL
----------
0.80mL
```
For 17.50mL + 5.827mL:
```
17.50mL
+ 5.827mL
----------
23.327mL
```
3. Determine the least number of decimal places in the original measurements and round the answer to that number of decimal places.
For 13.677mL + 7.70mL, both measurements have three decimal places, so the answer should have three decimal places. Rounded, the answer is:
```
21.377mL rounded to three decimal places is 21.4mL.
```
For 11.70mL - 10.9mL, both measurements have two decimal places, so the answer should have two decimal places. Rounded, the answer is:
```
0.80mL rounded to two decimal places is 0.80mL.
```
For 17.50mL + 5.827mL, the first measurement has two decimal places, and the second measurement has three decimal places. The answer should have two decimal places to match the measurement with fewer decimal places. Rounded, the answer is:
```
23.327mL rounded to two decimal places is 23.33mL.
```
So, the answers are:
1. 13.677mL + 7.70mL = 21.4mL
2. 11.70mL - 10.9mL = 0.80mL
3. 17.50mL + 5.827mL = 23.33mL