Question

expression 1/8 plus 2/5
Estimate


expression 13/14-1/10
Estimate

expression 1/12+1/20
expression

Answer 1

To estimate the given expressions, we can round the fractions to numbers that are easier to work with.

### For the expression \( \frac{1}{8} + \frac{2}{5} \):

- Estimate \( \frac{1}{8} \) as approximately \( 0.125 \) (or round to \( 0.12 \)).
- Estimate \( \frac{2}{5} \) as approximately \( 0.4 \).

So,

\[
0.125 + 0.4 \approx 0.525 \quad \text{(which can be rounded to about } 0.5\text{)}
\]

### For the expression \( \frac{13}{14} - \frac{1}{10} \):

- Estimate \( \frac{13}{14} \) as approximately \( 1 \).
- Estimate \( \frac{1}{10} \) as \( 0.1 \).

So,

\[
1 - 0.1 = 0.9
\]

### For the expression \( \frac{1}{12} + \frac{1}{20} \):

- Estimate \( \frac{1}{12} \) as approximately \( 0.08 \) (or round to \( 0.083 \)).
- Estimate \( \frac{1}{20} \) as \( 0.05 \).

So,

\[
0.08 + 0.05 \approx 0.13
\]

### Summary of Estimates
1. \( \frac{1}{8} + \frac{2}{5} \approx 0.5 \)
2. \( \frac{13}{14} - \frac{1}{10} \approx 0.9 \)
3. \( \frac{1}{12} + \frac{1}{20} \approx 0.13 \)