Step: 1

[Round to 1, if the numerator almost equals the denominator.]

Step: 2

[Round to 0, if the numerator is close to 0.]

Step: 3

[Round the fractions and subtract.]

Step: 4

Therefore, 3 5 - 1 4 ≈ 1.

Correct Answer is : 1

Step: 1

Weight of potatoes = 1 1 8 lb

Step: 2

[1 8 is close to 0.]

Step: 3

Weight of tomatoes = 1 2 7 lb

Step: 4

[2 7 is close to 0.]

Step: 5

Total weight of vegetables = Weight of potatoes + Weight of tomatoes

Step: 6

= 1 + 1 = 2

[Substitute the values and add.]

Step: 7

So, the weight of the vegetables is about 2 lb.

Correct Answer is : 2 lb

Step: 1

[Round to 1, if the numerator almost equals the denominator.]

Step: 2

[Round to 1, if the numerator almost equals the denominator.]

Step: 3

1 + 1 = 2

[Round the fractions and add.]

Step: 4

[Round the fractions and add.]

Step: 5

Therefore, 7 8 + 5 6 ≈ 2.

Correct Answer is : 2

Step: 1

Step: 2

Step: 3

The sum of the two needles = 1 + 2 = 3 in.

Step: 4

So, the total length of the two needles is about 3 in.

Correct Answer is : 3 in.

Step: 1

[Because 5 9 > 1 2 , round up to 51.]

Step: 2

[Because 7 9 > 1 2 , round up to 21.]

Step: 3

[Subtract.]

Step: 4

So, John traveled about 30 km by car.

Correct Answer is : 30 km

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