Question

What is the estimate for each expression? Drag the number to each box.011/2Expression Estimate2+513 114 101+12 20-1009

Answer 1

Explanation:

We must approximate each addition or subtraction, estimating if it is close to 0, 1/2 or 1.

We operate in each case:

`\begin{gathered} (1)/(8)+(2)/(5)=(1\cdot5+2\cdot8)/(8\cdot5)=(5+16)/(40)=(21)/(40)=0.525\approx(1)/(2) \\ \\ (13)/(14)-(1)/(10)=(13\cdot10-1\cdot14)/(14\cdot10)=(130-14)/(140)=(116)/(140)=0.82\approx1 \\ \\ (1)/(12)+(1)/(20)=(20+12)/(12\cdot20)=(32)/(240)=0.13\approx0 \end{gathered}`