The expressions 1/8 + 2/5, 13/14 - 1/10, and 1/12 + 1/20 can be estimated as half (0.5), one (1), and half (0.5) or less respectively.
The following is an estimate for each fraction expression: Notice that 1/2 (0.5) is higher than 1/8 and less than 2/5, so it's a plausible estimate, but feel free to choose any estimate that comes near to the real result.
Estimating the values:
1. 1/8 + 2/5
1/8 is approximately 0.1.
2/5 is approximately 0.4.
Therefore, 1/8 + 2/5 is approximately 0.1 + 0.4 = 0.5.
2. 13/14 - 1/10
13/14 is approximately 1.
1/10 is approximately 0.1.
Therefore, 13/14 - 1/10 is approximately 1 - 0.1 = 0.9.
3. 1/12 + 1/20
1/12 is approximately 0.08.
1/20 is approximately 0.05.
Therefore, 1/12 + 1/20 is approximately 0.08 + 0.05 = 0.13.
Estimates:
1/8 + 2/5 ≈ 0.5
13/14 - 1/10 ≈ 0.9
1/12 + 1/20 ≈ 0.13