Lesson 4

Select all of the numbers that are greater than \(\text-5\).

1.3

\(\text-6\)

\(\text-12\)

\(\frac{1}{7}\)

\(\text-1\)

\(\text-4\)

Order these numbers from least to greatest: \(\frac12\), 0, 1, \(\text{-}1\frac{1}{2}\), \(\text{-}\frac{1}{2}\), \(\text-1\) 

Here are the boiling points of certain elements in degrees Celsius:

• Argon: -185.8
• Chlorine: -34
• Fluorine: -188.1
• Hydrogen: -252.87
• Krypton: -153.2

List the elements from least to greatest boiling points.

Explain why zero is considered its own opposite.

Explain how to make these calculations mentally.

1. \(99 + 54\)
2. \(244 - 99\)
3. \(99 \boldcdot 6\)
4. \(99 \boldcdot 15\)

Find the quotients.

1. \(\frac{1}{2} \div 2\)
2. \(2 \div 2\)
3. \(\frac{1}{2} \div \frac{1}{2}\)
4. \(\frac{38}{79} \div\frac{38}{79}\)

Over several months, the weight of a baby measured in pounds doubles. Does its weight measured in kilograms also double? Explain.