Looking at Problem 8, I can see the top ruler shows a mass of 300 grams (the pointer is at the 300 mark). The bottom ruler shows a mass of 0.7 grams (the pointer is between 0 and 1, specifically at 0.7 on the scale that goes from 0 to 10). Adding these together: 300 + 0.7 = 300.7 grams, which matches the answer provided.
The solution to this problem involves reading the mass from two different scales (rulers) for each object and adding them together to get the total mass. Each problem has a larger scale (typically in increments of 100 grams) and a smaller scale (in increments of 1 gram or less) to provide precise measurements. The answers provided in the image are all correct based on the readings from the rulers.
The pattern is consistent across all 8 problems:
- Read the value from the top ruler (larger scale)
- Read the value from the bottom ruler (smaller, more precise scale)
- Add the two values together to get the total mass
This exercise demonstrates how to measure mass using multiple scales for greater precision, similar to how a triple beam balance works in science labs.
Parent Tip: Review the logic above to help your child master the concept of measuring mass practice worksheet answer key.
