Final answer:
To estimate each sum or difference, replace each fraction with 0, 1/2, or 1. For example, 1/2 + 1 can be estimated as 0.5 + 1 = 1.5.
Step-by-step explanation:
To estimate each sum or difference, we can replace each fraction with 0, 1/2, or 1. For example, if we have the sum 1/2 + 1, we can estimate it by replacing 1/2 with 0.5 and 1 with 1. The estimated sum would then be 0.5 + 1 = 1.5.
Similarly, for a difference like 3/4 - 1/3, we can estimate it by replacing 3/4 with 0.75 and 1/3 with approximately 0.33. The estimated difference would then be 0.75 - 0.33 = 0.42.