Mermaid500
New member
- Joined
- Aug 25, 2021
- Messages
- 8
Hi everyone!
I got such great help when I made my first post, I thought I would ask if someone could double check a problem for me. My 10 year old has completed the problem but we are not sure if it is correct.
Omar measures one machine part with length 4.392 centimeters and another part with length
6.82 centimeters. What is the difference in length? Use estimation to check your answer for
reasonableness.
We did 6.82 - 4.392 = Our answer was 2.428.
We tried using estimation to check our answer and we got 3.0. Because 6.8 is rounded up to 7.0 and 4.3 is rounded down to 4.0, this is how we got 3.0. When we subtracted 7.0- 4.0 = 3.0
Even though we do not have to include the 3.0 to our answer, I'm wondering if we did something wrong because 2.428 should be rounded down to 2.0, not up to 3.0.
Thoughts? Comments would be very appreciated. Thanks in advance!
I got such great help when I made my first post, I thought I would ask if someone could double check a problem for me. My 10 year old has completed the problem but we are not sure if it is correct.
Omar measures one machine part with length 4.392 centimeters and another part with length
6.82 centimeters. What is the difference in length? Use estimation to check your answer for
reasonableness.
We did 6.82 - 4.392 = Our answer was 2.428.
We tried using estimation to check our answer and we got 3.0. Because 6.8 is rounded up to 7.0 and 4.3 is rounded down to 4.0, this is how we got 3.0. When we subtracted 7.0- 4.0 = 3.0
Even though we do not have to include the 3.0 to our answer, I'm wondering if we did something wrong because 2.428 should be rounded down to 2.0, not up to 3.0.
Thoughts? Comments would be very appreciated. Thanks in advance!