For question 1-2 estimate the sum or difference. use the bench marks 0 1/2 and 1

1. 23/40 - 11/30

2. Simone measures the width of one cardboard strip as 1/2 yd. A second cardboard strip measures 5/6 yd in width estimate the combined width of the cardboard strips.

By the way, I am pretty sure the first one is 1/2. and the second one is like, 1. I just need someone to check my answer

3 answers

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Answers are
1=A
2=D
3=D
4=A
5=D
6=A
7=D
8=D

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1.

23 / 40 - 11 / 30 = 3 ∙ 23 / 3 ∙ 40 - 4 ∙ 11 / 4 ∙ 30 =

69 / 120 - 44 / 120 = 25 / 120 = 5 ∙ 5 / 5 ∙ 24 = 5 / 24

2.

5 / 6 + 1 / 2 = 5 / 6 + 3 ∙ 1 / 3 ∙ 2 =

5 / 6 + 3 / 6 = 8 / 6 = 2 ∙ 4 / 2 ∙ 3 = 4 / 3
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