Mental Math and Number Concepts

This video tutorial covers ordering rational numbers, identifying numbers greater than -5, and ordering numbers from least to greatest using a number line. It explains the boiling points of elements, why zero is its own opposite, and techniques for mental calculations. The video also demonstrates finding quotients of fractions and discusses weight conversion and doubling in different units.

Which of the following numbers is greater than -5?

• -5

• -6

• -5.5

• -4

Arrange the following numbers from least to greatest: 1/2, 0, -1, -1.5.

• 1/2, 0, -1, -1.5

• 0, -1.5, -1, 1/2

• -1, -1.5, 0, 1/2

• -1.5, -1, 0, 1/2

Which element has the lowest boiling point?

• Chlorine

• Argon

• Fluorine

• Hydrogen

Why is zero considered its own opposite?

• It is neutral

• It is negative

• It is both positive and negative

• It is positive

What is the result of 99 + 54 when calculated mentally?

• 152

• 153

• 155

• 154

How can you simplify 244 - 99 mentally?

• 245 - 100

• 243 - 98

• 244 - 100

• 245 - 99

What is the result of 99 times 6 when calculated mentally?

• 600

• 588

• 594

• 606

What is the result of 1/2 divided by 2?

• 1/4

• 1/2

• 2

• 1

What is the quotient of 1/2 divided by 1/2?

• 2

• 1/4

• 1

• 0

If a baby's weight doubles in pounds, does it also double in kilograms?

• Yes

• Depends on the scale

• Only if converted

• No