Question

What is the estimate for each expression? Drag the number to each box.

(2 points)
Put responses in the correct response input area to answer the question. Select a response, navigate to the desired input area and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
Expression Estimate
18+25
Press enter key to drop response here.The estimate of one over eight plus two over 5

1314−110
Press enter key to drop response here.The estimate of thirteen over fourteen minus one over 10

112+120
Press enter key to drop response here.The estimate of one over twelve plus one over twenty

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Answer 1

Here are reasonable estimates (with brief work):

- 18 + 25 ≈ 20 + 30 = 50 (actual 43)
- 13/14 − 1/10 ≈ 0.93 − 0.10 ≈ 0.83 → estimate 0.8
- 1/12 + 1/20 ≈ 0.083 + 0.05 ≈ 0.133 → estimate 0.13

So place: 50 for 18+25; 0.8 for 13/14 − 1/10; 0.13 for 1/12 + 1/20.