Subtracting Integers and Temperature Changes

This video tutorial covers lesson 1.3 on subtracting integers. It introduces three methods: using counters, a number line, and adding the opposite. The tutorial explains how to use zero pairs with counters and demonstrates subtraction on a number line. It also introduces rules for integer operations and provides a practical example involving temperature change. The session concludes with guided practice for students to complete on their own.

What are the three methods introduced for subtracting integers?

• Using graphs, charts, and tables

• Using fractions, decimals, and percentages

• Using multiplication, division, and addition

• Using counters, number line, and adding the opposite

What is a zero pair in the context of integer subtraction?

• A pair of numbers that are both zero

• A pair of positive numbers

• A pair of negative numbers

• A pair consisting of one positive and one negative number that sums to zero

When using counters, what should you do if you don't have enough negative counters to subtract?

• Multiply the counters

• Subtract positive counters

• Add zero pairs

• Add more positive counters

How do you rewrite subtraction as addition of the opposite on a number line?

• By adding the same number

• By subtracting the same number

• By adding the negative of the number

• By multiplying by zero

What is the result of subtracting a positive number on a number line?

• It is the same as multiplying by zero

• It is the same as subtracting a negative number

• It is the same as adding a negative number

• It is the same as adding a positive number

What is the key step in using a number line to subtract integers?

• Finding the opposite and then using the number line

• Multiplying the numbers

• Dividing the numbers

• Finding the sum of the numbers

What is the result of negative seven minus negative three using the number line method?

• Negative four

• Negative ten

• Zero

• Positive four

What should you do if you are unsure about the result using counters?

• Use a number line

• Use a calculator

• Guess the answer

• Recheck using counters and explain

In the temperature example, what is the change in temperature from -5°C to -2°C?

• A decrease of 7°C

• A decrease of 3°C

• An increase of 7°C

• An increase of 3°C

What is the final temperature change if the temperature falls from -2°C to 10°C?

• An increase of 8°C

• A decrease of 8°C

• A decrease of 12°C

• An increase of 12°C