Question
Jessica wanted to know how much farther she ran in Week 2 than in Week 1. Her work is below.
15.05 minus 11.90 = 5.95. The decimals in the equation are all aligned. The 0 in 15.05 is crossed out and a 10 is above it. The first 5 in 15.05 is crossed out and a 6 is above it.
What mistakes did Jessica make when solving the problem? Select all that apply.
She did not align the decimal points.
She did not subtract 10 and 9 correctly.
She subtracted instead of adding.
She did not rename correctly.
15.05 minus 11.90 = 5.95. The decimals in the equation are all aligned. The 0 in 15.05 is crossed out and a 10 is above it. The first 5 in 15.05 is crossed out and a 6 is above it.
What mistakes did Jessica make when solving the problem? Select all that apply.
She did not align the decimal points.
She did not subtract 10 and 9 correctly.
She subtracted instead of adding.
She did not rename correctly.
Answers
GPT-4o mini
Based on Jessica's work, the following mistakes can be identified:
1. **She did not align the decimal points.** - This is not a mistake; Jessica did align the decimal points correctly in her initial equation of 15.05 - 11.90.
2. **She did not subtract 10 and 9 correctly.** - This is a mistake. It seems that when she borrowed, she did not perform the subsequent subtraction correctly with the values.
3. **She subtracted instead of adding.** - This is not applicable, as the operation was correctly stated as subtraction in her problem.
4. **She did not rename correctly.** - This is a mistake. It appears that she made errors when renaming (borrowing) during the subtraction process.
Therefore, the mistakes Jessica made are:
- She did not subtract 10 and 9 correctly.
- She did not rename correctly.
1. **She did not align the decimal points.** - This is not a mistake; Jessica did align the decimal points correctly in her initial equation of 15.05 - 11.90.
2. **She did not subtract 10 and 9 correctly.** - This is a mistake. It seems that when she borrowed, she did not perform the subsequent subtraction correctly with the values.
3. **She subtracted instead of adding.** - This is not applicable, as the operation was correctly stated as subtraction in her problem.
4. **She did not rename correctly.** - This is a mistake. It appears that she made errors when renaming (borrowing) during the subtraction process.
Therefore, the mistakes Jessica made are:
- She did not subtract 10 and 9 correctly.
- She did not rename correctly.